Hello Umby29,
Just a quick update - we had an internal team discussion and came to a correction. Plex does not currently support a Syncthing transfer because it uses a different media directory on umbrel which is shared with jellyfin, sonarr, radarr, lidarr and transmission. While there isn’t an easy way to move existing files into the media directory at the moment, the current setup works automatically if you use sonarr/radarr or transmission (directly) on Umbrel to download new media content.
We apologize for the mis-communication!
Thanks,
Max