Bit of personal advice: host the arr suite directly on a machine. Don’t use docker.

I know others here are smarter than me, but I had a LOT of trouble when I started getting -arr apps to play nice between a temporary disk (temp destination) and my network drive (final destination) from within docker. Lots of permission issues.

It sounds like you’re already there with “give the VM on proxmox a bunch of storage” but thought it worth calling out.