The GSEs developed the Uniform Collateral Data Portal® (UCDP®), which is a single portal for the electronic submission of appraisal data. Lenders are required to use the UCDP to deliver electronic appraisal data that conforms to the UAD before the delivery date of the mortgage loan to Fannie Mae or Freddie Mac. This requirement applies to all conventional mortgage loans for which an appraisal report is required.