TOPIC: Storage directory and S3

How can I specify an S3 directory in the "storage directory" field in the configuration? I need to manually create an order for a file hosted in S3, and the list of files to place in the order seems to be determined by the "storage directory" field in configuration, it seems. (Is that correct?) If I cannot set that directory to an S3 location, then how can I manually create an order for an S3 file?