No shit

Ok, that means that the issue is slimmed down to the permissions on the mounted smb share. Not docker or radarr which makes it easier to troubleshoot.

I am not a cifs share black belt though but continue from there :)

Can you create files and directories in /movies inside the docker container?

Have you set the correct chown permissions? ls -al /mnt/OrbiterVideo/movies

I have a similiar issue on a plex transcode folder that randomly resets permissions.

Does the ending / intervene maybe?

  - /mnt/OrbiterVideo/movies/:/movies

Is the share mounted?

Can you browse the mount from source machine?

Can you browse the share inside the docker container? (–interactive)

Spotify family only. Everything else on Plex with Radarr, Sonarr and private tracker.

Or join a smaller instance