The delivery should always contain a file object. It's optional to populate the 'File/Data' property, but not the 'File/FileName' property.

If File/Data is empty, then your response will include a property named 'FileUploadUri' for uploading the file itself. You'll have 30 min. for uploading your binary file - the link expires after that. PUT is the only valid request at the 'FileUploadUri' with a binary file within the request body. The header 'x-ms-blob-type: blockblob' is required. Once the file has been uploaded the delivery will be processed.