To add to this, here is a tutorial with video that goes into the permissions. One of the cockpit modules has had an update, so make sure you bump the version number.

• I had to make it a privileged container to get NFS working. If you only need SMB, unprivileged is fine.

www.apalrd.net/posts/2023/ultimate_nas/

I replaced a TrueNAS install with this and haven’t been happier. It was such a bloated resource hog for what an LXC and a podman/dockge install can do.