Hey @luke15 ,
Currently there is no (easy to implement) mechanism to do such things.
Previously you were able to se the filename using Set Presigned URL because the plugin didn’t allow parallel uploading, which is the case now. So I had to make a compromise.
This may be possible if you do not use Auto-Upload, so I may create an action targeting a given uuid to rename prior to upload/
If your aim is to prevent remote files from being overwritten bearing the same name while using Auto-Upload, I would recommend to set the Upload Folderwith a session-scoped random key.
Let me know if it helps.