post https://us-gov.legion.picogrid.com/v3/feeds/files
Upload file-based feed data using multipart/form-data. The request should contain a 'metadata_json_payload' field with JSON metadata matching the IngestFeedFileDataRequest schema, and a 'file' field with the binary file content. Note: This endpoint uses multipart/form-data, not application/json as shown in the schema below.