I’ve literally just set this all up and it’s working now after some tinkering, so here’s what I found out. Assuming you have correctly configured the sonarr/qbitorrent api keys and credentials:
When you make a TV show request in Sonarr, it will automatically add the torrent to your download client (e.g qbitorrent)
qbitorrent will then download the file to wherever you specify (e.g. /torrents/completed)
periodically, Sonarr will scan that /torrents/completed folder, and if it finds the tagged TV show, it will either copy or hard link that video file to your specified media folder (e.g. /media/tv-shows)
JellyFin will do the same, periodically scanning your media folders to see if there are any updates
EDIT: also if you are using docker containers, make sure that Sonars native /downloads folder is pointed at the same external folder your qBitTorrent is downloading files in
literally was going through the exact same thoughts as you a couple a weeks ago, tried so many different configurations but the one i found that worked was actually kinda simple
basically they way i did was to run a gluetun docker container, and then in the environment variables pass in the the fact i wanted this to use the WireGuard VPN manager, and then i passed in my Proton VPN wireguard api key (you’ll need a subscription for this)
then once that gluetun container is up and running, you literally just add “network_mode: service:gluetun” to any other containers that you want to use this VPN
can you can even test its working by sending a curl command to an ip checking site from within those containers connected to gluetun
and then also try shutting down that gluetun vpn, and see if you other services (e.g. qbitorrent, still work)