checkBulkUploadChecks if assets exist by checksumsRequest Body — REQUIREDassets object[] — REQUIREDchecksum string — REQUIREDbase64 or hex encoded sha1 hashid string — REQUIREDResponses200Schema — OPTIONALresults object[]action stringPossible values: [accept, reject]assetId string — OPTIONALid stringreason string — OPTIONALPossible values: [duplicate, unsupported-format]