How to load data file with encryption to fusion ERP and submit the ESS job through API

Summary:

I have created a PGP encryption key in Fusion Security console, and I am trying to load data file into fusion UCM with PGP encrypted using the key created in Fusion Security console using REST ErpIntegrations service and it is uploading into UCM. But when I try to submit the ESS job with Job option parameters for AP Invoice data migration through importBulkData webservice. It is throwing below error. Please advise if anyone faced this issue or came across this scenario.
Error Message: "There were no valid data files found in the zip file . Only .dat , .csv , .xml , .txt , .ack  files are accepted for data files"