I use my seedbox to download and I synchronize it to my local Plex server via syncthing, however, I don’t want to permanently store the data on the Plex server. I want to move it off once the download completes.
This is basically my setup.
My NAS has individual folders for torrent files, downloads in progress, Seeding.
Radarr/Sonarr monitors the Seeding folder. Then copies the file to the appropriate folder for Plex.