File Upload Permissions Issue

I've got a docker swarm cluster running Appwrite with a shared file system. The appwrite service is on a separate node than the storage service and where files are storage.

When I upload a file that is a bit larger (6MB, probably needs to upload by chunk) it will fail. The logs in the appwrite service say that it got a Permission denied when trying to rename a file from /tmp/swoole.upfile.NliAkB to /storage/uploads/app-.../[where the bucket files are].

When I try to do that myself via docker exec using the mv command on a file I create with touch, I get a can't preserve ownership of '...file': Permission denied error but the file does in-fact get moved because I can docker exec ls /storage/uploads/... and see the file there now.

Has anyone run into this problem before?

My current theory is that Appwrite expects the permissions to be a certain way and I don't know what that way is.