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  <xs:element name="ReclassificationOfLiabilityClassifiedWarrantsToEquityNote11" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ReclassificationOfLiabilityClassifiedWarrantsToEquityNote11"/>
  <xs:element name="ContributionByShareholderInConjunctionWithCreditAgreementNote7" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ContributionByShareholderInConjunctionWithCreditAgreementNote7"/>
  <xs:element name="EarnoutSharesOptionAndRSUHoldersNote1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_EarnoutSharesOptionAndRSUHoldersNote1"/>
  <xs:element name="MergerAndPIPEFinancing" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_MergerAndPIPEFinancing"/>
  <xs:element name="MergersAndPIPEFinancing" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_MergersAndPIPEFinancing"/>
  <xs:element name="EarnoutShareStockbasedCompensationExpenseToOptionHolders" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_EarnoutShareStockbasedCompensationExpenseToOptionHolders"/>
  <xs:element name="NoncashExpenseAttributableToFairValueLiabilitiesAssumedInMergers" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_NoncashExpenseAttributableToFairValueLiabilitiesAssumedInMergers"/>
  <xs:element name="ChangeInFairValueOfLiabilityClassifiedWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_ChangeInFairValueOfLiabilityClassifiedWarrants"/>
  <xs:element name="ChangeInFairValueOfWarrantsAndConvertiblePromissoryNotes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_ChangeInFairValueOfWarrantsAndConvertiblePromissoryNotes"/>
  <xs:element name="ShareAndWarrantCostOnTerminationOfConvertibleNoteAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_ShareAndWarrantCostOnTerminationOfConvertibleNoteAgreement"/>
  <xs:element name="ChangeInFairValueOfEarnoutLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ChangeInFairValueOfEarnoutLiability"/>
  <xs:element name="IncreaseDecreaseInOtherLongtermAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_IncreaseDecreaseInOtherLongtermAssets"/>
  <xs:element name="IncreaseDecreaseInVendorFinancingFacility" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_IncreaseDecreaseInVendorFinancingFacility"/>
  <xs:element name="ContributionsFromMergerAndPIPEFinancingNetOfTransactionCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_ContributionsFromMergerAndPIPEFinancingNetOfTransactionCosts"/>
  <xs:element name="PaymentsOfDeferredTransactionCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_PaymentsOfDeferredTransactionCosts"/>
  <xs:element name="CapitalizationOfStockbasedCompensationExpenseToCapitalizedSoftware" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_CapitalizationOfStockbasedCompensationExpenseToCapitalizedSoftware"/>
  <xs:element name="CapitalContributionFromShareholderInConjunctionWithCreditAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_CapitalContributionFromShareholderInConjunctionWithCreditAgreement"/>
  <xs:element name="IssuanceOfWarrantsInConjunctionWithCreditAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_IssuanceOfWarrantsInConjunctionWithCreditAgreement"/>
  <xs:element name="IssuanceOfWarrantsInConjunctionWithLagoTermLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_IssuanceOfWarrantsInConjunctionWithLagoTermLoan"/>
  <xs:element name="ConvertibleNoteConversionToCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ConvertibleNoteConversionToCommonStock"/>
  <xs:element name="ReclassificationOfWarrantsFromLiabilitiesToEquity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ReclassificationOfWarrantsFromLiabilitiesToEquity"/>
  <xs:element name="RecognitionOfLiabilityClassifiedWarrantsUponMerger" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_RecognitionOfLiabilityClassifiedWarrantsUponMerger"/>
  <xs:element name="RecognitionOfFoundersEarnoutLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_RecognitionOfFoundersEarnoutLiability"/>
  <xs:element name="ForgivenessOfPPPLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ForgivenessOfPPPLoan"/>
  <xs:element name="TransactionCostsRecordedInAccountsPayableAndAccruedLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_TransactionCostsRecordedInAccountsPayableAndAccruedLiabilities"/>
  <xs:element name="RightOfUseAssetInExchangeForOperatingLeaseLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_RightOfUseAssetInExchangeForOperatingLeaseLiability"/>
  <xs:element name="RevenueTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_RevenueTable"/>
  <xs:element name="RevenueLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_RevenueLineItems"/>
  <xs:element name="FinancingObligationsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FinancingObligationsTable"/>
  <xs:element name="FinancingObligationsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FinancingObligationsLineItems"/>
  <xs:element name="LossOnInfrequentProductRepairsTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_LossOnInfrequentProductRepairsTextBlock"/>
  <xs:element name="LossonInfrequentProductRepairsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_LossonInfrequentProductRepairsTable"/>
  <xs:element name="LossonInfrequentProductRepairsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_LossonInfrequentProductRepairsLineItems"/>
  <xs:element name="DisclosureOfWarrantsTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_DisclosureOfWarrantsTextBlock"/>
  <xs:element name="CyborgOpsTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CyborgOpsTextBlock"/>
  <xs:element name="CyborgOpsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_CyborgOpsTable"/>
  <xs:element name="CyborgOpsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CyborgOpsLineItems"/>
  <xs:element name="MergerWithVentouxCCMAcquisitionCorpPolicyPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_MergerWithVentouxCCMAcquisitionCorpPolicyPolicyTextBlock"/>
  <xs:element name="EmergingGrowthCompanyPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_EmergingGrowthCompanyPolicyTextBlock"/>
  <xs:element name="ImpactOfCOVID19PolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ImpactOfCOVID19PolicyTextBlock"/>
  <xs:element name="LiquidityAndCapitalResourcesPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_LiquidityAndCapitalResourcesPolicyTextBlock"/>
  <xs:element name="NewAccountingPronouncementsNotYetAdoptedPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_NewAccountingPronouncementsNotYetAdoptedPolicyTextBlock"/>
  <xs:element name="ScheduleOfTrustAndPIPENetOfFeesAndExpensesTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ScheduleOfTrustAndPIPENetOfFeesAndExpensesTableTextBlock"/>
  <xs:element name="RevenueTablesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_RevenueTablesTable"/>
  <xs:element name="RevenueTablesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_RevenueTablesLineItems"/>
  <xs:element name="ScheduleOfFairValueOfLevel3ConvertiblePromissoryNotesTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ScheduleOfFairValueOfLevel3ConvertiblePromissoryNotesTableTextBlock"/>
  <xs:element name="FinancingObligationsTablesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FinancingObligationsTablesTable"/>
  <xs:element name="FinancingObligationsTablesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FinancingObligationsTablesLineItems"/>
  <xs:element name="ScheduleOfWarrantsOnCommonStockOutstandingTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ScheduleOfWarrantsOnCommonStockOutstandingTableTextBlock"/>
  <xs:element name="ScheduleOfStockbasedCompensationExpenseExcludingStockbasedCompensationInCapitalizedSoftwareTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ScheduleOfStockbasedCompensationExpenseExcludingStockbasedCompensationInCapitalizedSoftwareTableTextBlock"/>
  <xs:element name="ScheduleOfNetLossPerShareAttributableToCommonStockholdersTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ScheduleOfNetLossPerShareAttributableToCommonStockholdersTableTextBlock"/>
  <xs:element name="CashVentouxTrustAndWorkingCapitalCash" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_CashVentouxTrustAndWorkingCapitalCash"/>
  <xs:element name="CashPIPEInvestment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_CashPIPEInvestment"/>
  <xs:element name="TotalofNetFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_TotalofNetFees"/>
  <xs:element name="ConcentrationRiskThresholdPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ConcentrationRiskThresholdPercentage"/>
  <xs:element name="FairValueMeasurementsDetailsScheduleoffinancialinstrumentsmeasuredatfairvalueonarecurringbasisTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FairValueMeasurementsDetailsScheduleoffinancialinstrumentsmeasuredatfairvalueonarecurringbasisTable"/>
  <xs:element name="FairValueMeasurementsDetailsScheduleoffinancialinstrumentsmeasuredatfairvalueonarecurringbasisLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueMeasurementsDetailsScheduleoffinancialinstrumentsmeasuredatfairvalueonarecurringbasisLineItems"/>
  <xs:element name="EarnoutLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_EarnoutLiability"/>
  <xs:element name="ConvertiblePromissoryNotesAndEmbeddedWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ConvertiblePromissoryNotesAndEmbeddedWarrants"/>
  <xs:element name="FairValueMeasurementsDetailsScheduleofestimatedthefairvalueoftheconvertiblepromissorynotesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FairValueMeasurementsDetailsScheduleofestimatedthefairvalueoftheconvertiblepromissorynotesTable"/>
  <xs:element name="FairValueMeasurementsDetailsScheduleofestimatedthefairvalueoftheconvertiblepromissorynotesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueMeasurementsDetailsScheduleofestimatedthefairvalueoftheconvertiblepromissorynotesLineItems"/>
  <xs:element name="ConversionPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ConversionPercentage"/>
  <xs:element name="ExpectedTerminYears" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ExpectedTerminYears"/>
  <xs:element name="ChargedToEarningsConvertiblePromissoryNotesAndEmbeddedWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ChargedToEarningsConvertiblePromissoryNotesAndEmbeddedWarrants"/>
  <xs:element name="FairValueConvertiblePromissoryNotesAndEmbeddedWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueConvertiblePromissoryNotesAndEmbeddedWarrants"/>
  <xs:element name="ConvertiblePromissoryNotesAndEmbeddedWarrant" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ConvertiblePromissoryNotesAndEmbeddedWarrant"/>
  <xs:element name="AmountChargedToEarningsTotal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_AmountChargedToEarningsTotal"/>
  <xs:element name="FairValueConvertiblePromissoryNotesAndEmbeddedWarrantsTotal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueConvertiblePromissoryNotesAndEmbeddedWarrantsTotal"/>
  <xs:element name="FairValueMeasurementsDetailsScheduleoffairvalueofLevel3convertiblepromissorynotesandembeddedwarrantsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FairValueMeasurementsDetailsScheduleoffairvalueofLevel3convertiblepromissorynotesandembeddedwarrantsTable"/>
  <xs:element name="FairValueMeasurementsDetailsScheduleoffairvalueofLevel3convertiblepromissorynotesandembeddedwarrantsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueMeasurementsDetailsScheduleoffairvalueofLevel3convertiblepromissorynotesandembeddedwarrantsLineItems"/>
  <xs:element name="IssuanceOfConvertiblePromissoryNotes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_IssuanceOfConvertiblePromissoryNotes"/>
  <xs:element name="RecognitionOfWarrantsAndEarnoutLiabilitiesAssumedUponMerger" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_RecognitionOfWarrantsAndEarnoutLiabilitiesAssumedUponMerger"/>
  <xs:element name="ConversionOfWarrantLiabilitiesAndConvertiblePromissoryNotes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_ConversionOfWarrantLiabilitiesAndConvertiblePromissoryNotes"/>
  <xs:element name="ConsolidatedBalanceSheetComponentsDetailsScheduleofintangibleassetshaveweightedaverageamortizationperiodsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_ConsolidatedBalanceSheetComponentsDetailsScheduleofintangibleassetshaveweightedaverageamortizationperiodsTable"/>
  <xs:element name="ConsolidatedBalanceSheetComponentsDetailsScheduleofintangibleassetshaveweightedaverageamortizationperiodsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ConsolidatedBalanceSheetComponentsDetailsScheduleofintangibleassetshaveweightedaverageamortizationperiodsLineItems"/>
  <xs:element name="OperatingLeasesLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_OperatingLeasesLiability"/>
  <xs:element name="FinancingObligations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_FinancingObligations"/>
  <xs:element name="PPPLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_PPPLoan"/>
  <xs:element name="StockholdersEquityDeficitDetailsScheduleofsharesofcommonstockreservedforfutureissuanceTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_StockholdersEquityDeficitDetailsScheduleofsharesofcommonstockreservedforfutureissuanceTable"/>
  <xs:element name="StockholdersEquityDeficitDetailsScheduleofsharesofcommonstockreservedforfutureissuanceLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_StockholdersEquityDeficitDetailsScheduleofsharesofcommonstockreservedforfutureissuanceLineItems"/>
  <xs:element name="EarnoutShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_EarnoutShares"/>
  <xs:element name="WarrantsDetailsScheduleofwarrantsoncommonstockoutstandingTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_WarrantsDetailsScheduleofwarrantsoncommonstockoutstandingTable"/>
  <xs:element name="WarrantsDetailsScheduleofwarrantsoncommonstockoutstandingLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WarrantsDetailsScheduleofwarrantsoncommonstockoutstandingLineItems"/>
  <xs:element name="ExpirationDate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ExpirationDate"/>
  <xs:element name="LonnTermDebts" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_LonnTermDebts"/>
  <xs:element name="NumberOfOptionsOutstandingRetrospectiveApplicationOfRecapitalization" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_NumberOfOptionsOutstandingRetrospectiveApplicationOfRecapitalization"/>
  <xs:element name="WeightedAverageExercisePriceRetrospectiveApplicationOfRecapitalizationinDollars" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WeightedAverageExercisePriceRetrospectiveApplicationOfRecapitalizationinDollars"/>
  <xs:element name="WeightedAverageRemainingContractualLifeyearsRetrospectiveApplicationOfRecapitalization" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WeightedAverageRemainingContractualLifeyearsRetrospectiveApplicationOfRecapitalization"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue2" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue2"/>
  <xs:element name="WeightedAverageExercisePriceForfeitedAndExpired" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WeightedAverageExercisePriceForfeitedAndExpired"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeitedAndExpiredWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeitedAndExpiredWeightedAverageRemainingContractualTerm"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeitedAndExpiredIntrinsicValue1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeitedAndExpiredIntrinsicValue1"/>
  <xs:element name="SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm"/>
  <xs:element name="NumberOfAwardsOutstandingRetrospectiveApplicationOfRecapitalizationinDollars" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_NumberOfAwardsOutstandingRetrospectiveApplicationOfRecapitalizationinDollars"/>
  <xs:element name="WeighteAverageGrantDateFairValueRetrospectiveapplicationofrecapitalization" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WeighteAverageGrantDateFairValueRetrospectiveapplicationofrecapitalization"/>
  <xs:element name="WeightedAverageGrantDateFairValueAdjustedUnvestedBalance" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WeightedAverageGrantDateFairValueAdjustedUnvestedBalance"/>
  <xs:element name="WeightedAverageGrantDateFairValueGranted" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WeightedAverageGrantDateFairValueGranted"/>
  <xs:element name="CommonStockWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_CommonStockWarrants"/>
  <xs:element name="SummaryofBusinessandSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_SummaryofBusinessandSignificantAccountingPoliciesDetailsTable"/>
  <xs:element name="SummaryofBusinessandSignificantAccountingPoliciesDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_SummaryofBusinessandSignificantAccountingPoliciesDetailsLineItems"/>
  <xs:element name="PaymentsToCashWithdrawnFromTrustAccountInConnectionWithRedemption" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_PaymentsToCashWithdrawnFromTrustAccountInConnectionWithRedemption"/>
  <xs:element name="UnredeemedFunds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_UnredeemedFunds"/>
  <xs:element name="AggregateOfShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_AggregateOfShares"/>
  <xs:element name="NetOfFeesAndExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_NetOfFeesAndExpenses"/>
  <xs:element name="UtilizingProceedsFromTrust" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_UtilizingProceedsFromTrust"/>
  <xs:element name="ConvertedPerShare" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="prst_ConvertedPerShare"/>
  <xs:element name="weightedaveragePeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_weightedaveragePeriod"/>
  <xs:element name="PIPEProceedsAmount" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_PIPEProceedsAmount"/>
  <xs:element name="RetainedEarningsAccumulatedDeficits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_RetainedEarningsAccumulatedDeficits"/>
  <xs:element name="ConcentrationRiskPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ConcentrationRiskPercentage"/>
  <xs:element name="OperatingLeaseRightOfUsesAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_OperatingLeaseRightOfUsesAsset"/>
  <xs:element name="RevenueDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_RevenueDetailsTable"/>
  <xs:element name="RevenueDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_RevenueDetailsLineItems"/>
  <xs:element name="InterestAccruedPercent" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_InterestAccruedPercent"/>
  <xs:element name="ReductionToDeferredRevenue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_ReductionToDeferredRevenue"/>
  <xs:element name="InterestExpenseRecognized" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_InterestExpenseRecognized"/>
  <xs:element name="RevenueShareAgreementPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_RevenueShareAgreementPercentage"/>
  <xs:element name="FairValueMeasurementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FairValueMeasurementsDetailsTable"/>
  <xs:element name="FairValueMeasurementsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueMeasurementsDetailsLineItems"/>
  <xs:element name="NonCancelableOperatingLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_NonCancelableOperatingLease"/>
  <xs:element name="FinancingObligationsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_FinancingObligationsDetailsTable"/>
  <xs:element name="FinancingObligationsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FinancingObligationsDetailsLineItems"/>
  <xs:element name="ReceivableFinancingFacilityTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ReceivableFinancingFacilityTerm"/>
  <xs:element name="EquipmentFinancingFacilityTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_EquipmentFinancingFacilityTerm"/>
  <xs:element name="DebtArrangementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_DebtArrangementsDetailsTable"/>
  <xs:element name="DebtArrangementsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_DebtArrangementsDetailsLineItems"/>
  <xs:element name="LoanAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_LoanAmount"/>
  <xs:element name="InterestBears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_InterestBears"/>
  <xs:element name="PurchaseOfCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_PurchaseOfCommonStock"/>
  <xs:element name="AdditionalLoanAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_AdditionalLoanAmount"/>
  <xs:element name="CreditAgreementDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CreditAgreementDescription"/>
  <xs:element name="WarrantsToPurchaseCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WarrantsToPurchaseCommonStock"/>
  <xs:element name="InterestAccrual" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="prst_InterestAccrual"/>
  <xs:element name="InterestAndFeeIncomeFromMortgageLoans" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_InterestAndFeeIncomeFromMortgageLoans"/>
  <xs:element name="RefurbishCustomerTablets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_RefurbishCustomerTablets"/>
  <xs:element name="LossonInfrequentProductRepairsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_LossonInfrequentProductRepairsDetailsTable"/>
  <xs:element name="LossonInfrequentProductRepairsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_LossonInfrequentProductRepairsDetailsLineItems"/>
  <xs:element name="StockholdersEquityDeficitDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_StockholdersEquityDeficitDetailsTable"/>
  <xs:element name="StockholdersEquityDeficitDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_StockholdersEquityDeficitDetailsLineItems"/>
  <xs:element name="investorInExchange" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_investorInExchange"/>
  <xs:element name="TerminationInExchange" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_TerminationInExchange"/>
  <xs:element name="AgreedToPayExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_AgreedToPayExpenses"/>
  <xs:element name="WarrantsOfPurchase" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WarrantsOfPurchase"/>
  <xs:element name="WarrantsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_WarrantsDetailsTable"/>
  <xs:element name="WarrantsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WarrantsDetailsLineItems"/>
  <xs:element name="CreditAgreementShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CreditAgreementShares"/>
  <xs:element name="StockBasedCompensationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_StockBasedCompensationDetailsTable"/>
  <xs:element name="StockBasedCompensationDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_StockBasedCompensationDetailsLineItems"/>
  <xs:element name="CommonStockReservedForFutureIssuance" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CommonStockReservedForFutureIssuance"/>
  <xs:element name="GrantDateFairValue" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_GrantDateFairValue"/>
  <xs:element name="ShareBasedCompensationDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ShareBasedCompensationDescription"/>
  <xs:element name="AggregateIntrinsicValueOfOptionsExercised" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_AggregateIntrinsicValueOfOptionsExercised"/>
  <xs:element name="EmployeeStockPurchasePlanDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_EmployeeStockPurchasePlanDescription"/>
  <xs:element name="AcquiredFiniteLivedIntangibleAssetWeightedAveragePeriodBeforeRenewalarExtension" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_AcquiredFiniteLivedIntangibleAssetWeightedAveragePeriodBeforeRenewalarExtension"/>
  <xs:element name="OptionsToPurchase" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_OptionsToPurchase"/>
  <xs:element name="DilutedEPS" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_DilutedEPS"/>
  <xs:element name="CyborgOpsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="prst_CyborgOpsDetailsTable"/>
  <xs:element name="CyborgOpsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CyborgOpsDetailsLineItems"/>
  <xs:element name="ResearchAndDevelopment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_ResearchAndDevelopment"/>
  <xs:element name="MarketingExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_MarketingExpenses"/>
  <xs:element name="FairValueOfRSU" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="prst_FairValueOfRSU"/>
  <xs:element name="ChangeInControlMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ChangeInControlMember"/>
  <xs:element name="Common10Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common10Member"/>
  <xs:element name="Common11Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common11Member"/>
  <xs:element name="Common12Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common12Member"/>
  <xs:element name="Common13Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common13Member"/>
  <xs:element name="Common14Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common14Member"/>
  <xs:element name="Common15Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common15Member"/>
  <xs:element name="Common1Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common1Member"/>
  <xs:element name="Common2Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common2Member"/>
  <xs:element name="Common3Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common3Member"/>
  <xs:element name="Common4Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common4Member"/>
  <xs:element name="Common5Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common5Member"/>
  <xs:element name="Common6Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common6Member"/>
  <xs:element name="Common7Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common7Member"/>
  <xs:element name="Common8Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common8Member"/>
  <xs:element name="Common9Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_Common9Member"/>
  <xs:element name="CommonMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CommonMember"/>
  <xs:element name="ConvertiblePromissoryNotesAndEmbeddedWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ConvertiblePromissoryNotesAndEmbeddedWarrantsMember"/>
  <xs:element name="CreditAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CreditAgreementMember"/>
  <xs:element name="CustomerAMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CustomerAMember"/>
  <xs:element name="CustomerBMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CustomerBMember"/>
  <xs:element name="CustomerCMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CustomerCMember"/>
  <xs:element name="CustomerDMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_CustomerDMember"/>
  <xs:element name="DepreciationAndImpairmentMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_DepreciationAndImpairmentMember"/>
  <xs:element name="DomainNameMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_DomainNameMember"/>
  <xs:element name="EarnoutLiabilityMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_EarnoutLiabilityMember"/>
  <xs:element name="FifthAnniversaryMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FifthAnniversaryMember"/>
  <xs:element name="FinancialLiabilitiesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FinancialLiabilitiesMember"/>
  <xs:element name="FirstPPPLoanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_FirstPPPLoanMember"/>
  <xs:element name="HorizonLoansMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_HorizonLoansMember"/>
  <xs:element name="MaturityDateMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_MaturityDateMember"/>
  <xs:element name="NextFinancingPrivateMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_NextFinancingPrivateMember"/>
  <xs:element name="NextFinancingPublicMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_NextFinancingPublicMember"/>
  <xs:element name="OtherStockbasedCompensationMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_OtherStockbasedCompensationMember"/>
  <xs:element name="PlatformMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_PlatformMember"/>
  <xs:element name="PublicWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_PublicWarrantsMember"/>
  <xs:element name="SecondPPPLoanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_SecondPPPLoanMember"/>
  <xs:element name="SoftwareMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_SoftwareMember"/>
  <xs:element name="StockbasedCompensationExpenseMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_StockbasedCompensationExpenseMember"/>
  <xs:element name="TabletsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_TabletsMember"/>
  <xs:element name="ThirdAnniversaryMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ThirdAnniversaryMember"/>
  <xs:element name="ThirdPartyFinanciersMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_ThirdPartyFinanciersMember"/>
  <xs:element name="TransactionMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_TransactionMember"/>
  <xs:element name="WarrantLiabilitiesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_WarrantLiabilitiesMember"/>
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="prst_DocumentAndEntityInformationAbstract"/>
</xs:schema>
