<?xml version="1.0" encoding="US-ASCII" ?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 6.5c -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
    <!-- Field: Doc-Info; Name: Misc; Value: /q85o7xRiXgen8uLaXFcOa6OWcPtwJV7KYkhuml1fUkabyouhQjBkyolvFpGQUMJ -->
<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:dei="http://xbrl.sec.gov/dei/2026" xmlns:us-gaap="http://fasb.org/us-gaap/2026" xmlns:oef="http://xbrl.sec.gov/oef/2026" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:potomac="http://potomac/20260630" elementFormDefault="qualified" targetNamespace="http://potomac/20260630">
    <annotation>
      <appinfo>
        <link:linkbaseRef xlink:type="simple" xlink:href="potomac-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Presentation Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="potomac-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Label Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="potomac-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links" />
      </appinfo>
    </annotation>
    <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
    <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
    <import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd" />
    <import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd" />
    <import namespace="http://fasb.org/us-types/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-types-2026.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
    <import namespace="http://xbrl.sec.gov/oef/2026" schemaLocation="https://xbrl.sec.gov/oef/2026/oef-2026.xsd" />
    <import namespace="http://xbrl.sec.gov/oef-sr/2026" schemaLocation="https://xbrl.sec.gov/oef/2026/oef-sr-2026.xsd" />
    <import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd" />
    <import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd" />
    <import namespace="http://fasb.org/srt-types/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-types-2026.xsd" />
    <element id="potomac_C000219677Member" name="C000219677Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacDefensiveBullFundInstitutionalClassSampP500sup174supIndexMember" name="PotomacDefensiveBullFundInstitutionalClassSampP500sup174supIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacDefensiveBullFundInstitutionalClassSampPTargetRiskAggressiveIndexMember" name="PotomacDefensiveBullFundInstitutionalClassSampPTargetRiskAggressiveIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_ISharesCoreSampP500ETFMember" name="ISharesCoreSampP500ETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_StateStreetInstitutionalUSGovernmentMoneyMarketFundPremierClassMember" name="StateStreetInstitutionalUSGovernmentMoneyMarketFundPremierClassMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_BondBloxxBloombergSixMonthTargetDurationUSTreasuryETFMember" name="BondBloxxBloombergSixMonthTargetDurationUSTreasuryETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_NetCashMember" name="NetCashMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000275767Member" name="C000275767Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacDefensiveBullFundClassRSampP500sup174supIndexMember" name="PotomacDefensiveBullFundClassRSampP500sup174supIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacDefensiveBullFundClassRSampPTargetRiskAggressiveIndexMember" name="PotomacDefensiveBullFundClassRSampPTargetRiskAggressiveIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000219678Member" name="C000219678Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacManagedVolatilityFundInstitutionalClassBloombergGlobalAggregateTotalReturnIndexMember" name="PotomacManagedVolatilityFundInstitutionalClassBloombergGlobalAggregateTotalReturnIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacManagedVolatilityFundInstitutionalClassSampPTargetRiskConservativeIndexMember" name="PotomacManagedVolatilityFundInstitutionalClassSampPTargetRiskConservativeIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_BondBloxxCCCRatedUSDHighYieldCorporateBondETFMember" name="BondBloxxCCCRatedUSDHighYieldCorporateBondETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_BondBloxxBBRatedUSDHighYieldCorporateBondETFMember" name="BondBloxxBBRatedUSDHighYieldCorporateBondETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_VanguardEmergingMarketsGovernmentIndexFundETFMember" name="VanguardEmergingMarketsGovernmentIndexFundETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_InvescoDBUSDollarIndexBullishFundMember" name="InvescoDBUSDollarIndexBullishFundMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_ISharesFallenAngelsUSDBondETFMember" name="ISharesFallenAngelsUSDBondETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_BondBloxxJPMorganUSDEmergingMarkets110YearBondETFMember" name="BondBloxxJPMorganUSDEmergingMarkets110YearBondETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000275768Member" name="C000275768Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacManagedVolatilityFundClassRBloombergGlobalAggregateTotalReturnIndexMember" name="PotomacManagedVolatilityFundClassRBloombergGlobalAggregateTotalReturnIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacManagedVolatilityFundClassRSampPTargetRiskConservativeIndexMember" name="PotomacManagedVolatilityFundClassRSampPTargetRiskConservativeIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000219679Member" name="C000219679Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalOpportunitiesFundInstitutionalClassSampP500sup174supIndexMember" name="PotomacTacticalOpportunitiesFundInstitutionalClassSampP500sup174supIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalOpportunitiesFundInstitutionalClassSampPTargetRiskBalancedIndexMember" name="PotomacTacticalOpportunitiesFundInstitutionalClassSampPTargetRiskBalancedIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_IShares03MonthTreasuryBondETFMember" name="IShares03MonthTreasuryBondETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_VanEckSemiconductorETFMember" name="VanEckSemiconductorETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_ISharesRussell2000GrowthETFMember" name="ISharesRussell2000GrowthETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_ISharesRussell2000ETFMember" name="ISharesRussell2000ETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_InvescoOptimumYieldDiversifiedCommodityStrategyNoK1ETFMember" name="InvescoOptimumYieldDiversifiedCommodityStrategyNoK1ETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_StateStreet174SPDR174SampP174MetalsampMiningETFMember" name="StateStreet174SPDR174SampP174MetalsampMiningETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_GlobalXSilverMinersETFMember" name="GlobalXSilverMinersETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_StateStreet174EnergySelectSectorSPDR174ETFMember" name="StateStreet174EnergySelectSectorSPDR174ETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000275769Member" name="C000275769Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalOpportunitiesFundClassRSampP500sup174supIndexMember" name="PotomacTacticalOpportunitiesFundClassRSampP500sup174supIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalOpportunitiesFundClassRSampPTargetRiskBalancedIndexMember" name="PotomacTacticalOpportunitiesFundClassRSampPTargetRiskBalancedIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000219680Member" name="C000219680Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalRotationFundInstitutionalClassSampP500sup174supIndexMember" name="PotomacTacticalRotationFundInstitutionalClassSampP500sup174supIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalRotationFundInstitutionalClassSampPTargetRiskModerateIndexMember" name="PotomacTacticalRotationFundInstitutionalClassSampPTargetRiskModerateIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_AstoriaUSEqualWeightQualityKingsETFMember" name="AstoriaUSEqualWeightQualityKingsETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_VanguardTotalStockMarketETFMember" name="VanguardTotalStockMarketETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_WisdomTreeUSQualityDividendGrowthFundMember" name="WisdomTreeUSQualityDividendGrowthFundMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_StateStreet174SPDR174BloombergConvertibleSecuritiesETFMember" name="StateStreet174SPDR174BloombergConvertibleSecuritiesETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_WisdomTreeJapanHedgedEquityFundMember" name="WisdomTreeJapanHedgedEquityFundMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000275770Member" name="C000275770Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalRotationFundClassRSampP500sup174supIndexMember" name="PotomacTacticalRotationFundClassRSampP500sup174supIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_PotomacTacticalRotationFundClassRSampPTargetRiskModerateIndexMember" name="PotomacTacticalRotationFundClassRSampPTargetRiskModerateIndexMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000271447Member" name="C000271447Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_StateStreet174SPDR174PortfolioSampP500174ETFMember" name="StateStreet174SPDR174PortfolioSampP500174ETFMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="potomac_C000275771Member" name="C000275771Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
</schema>
