I ran into these issues with sonarr. I believe my fix was how the volumes were labelled. My understanding is they communicated the directory but if the other sonarr doesn’t know where to look for it, it won’t be able to find it
This was when the torrent client is passing the location to sonarr is says thesimpsons.mp3 is located in data/download/the Simpson.mp3 and sonarr can then locate it
I would documented everything as I go.
I am a hobbyist running a proxmox server with a docker host for media server, a plex host, a nas host, and home assistant host.
I feel if It were to break It would take me a long time to rebuild.