Linux permissions problem

Sonarr version (exact version): 2.0.0.5344
Mono version (if Sonarr is not running on Windows): 5.18.0.240
OS: Ubuntu 19.10
Description of issue:

I am having a problem getting Sonarr to post-process downloaded files, then move them to my Plex media folder. Sonarr runs as myuser and Sabnzbd runs as sabnzbd. Sabnzbd downloads to /home/sabnzbd/Downloads/complete and my Plex library resides at /mnt/sdc1/tv (in this case)

This is in my Sonarr log:

20-3-21 08:45:47.6|Warn|ImportApprovedEpisodes|Couldn’t import episode /home/sabnzbd/Downloads/complete/…episode name…/8a96bd8519ca4f0db9daf9234a4ae55c.mkv

[v2.0.0.5344] System.UnauthorizedAccessException: Access to the path is denied.

I wasn’t sure, to what path the error was referring, so I ran this:

sudo chmod -R ugo+rw /home/sabnzbd/Downloads/
sudo chmod -R ugo+rw /mnt/sdc1/

To make sure both users can read and write to any sub-directory. That didn’t help.

The perms look like this:

/home/myuser# ls -l /home/sabnzbd/Downloads/
drwxrwxrwx 30 sabnzbd sabnzbd 4096 Mar 21 08:50 complete

and

/home/myuser# ls -l /mnt/sdc1/
drwxrwxrwx 1 root root 4096 Mar 18 15:00 tv

I thought that maybe, adding myuser to the groups with permission would help. I ran:

sudo usermod -a -G root myuser
sudo usermod -a -G sabnzbd myuser
groups myuser
myuser : myuser root ...truncatedlist... sabnzbd

Any thoughts on what I’m missing here?

I removed ‘user’ and ‘group’ definitions from the service file (myuser for both). After a service restart, the move started working.

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