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.
You can specify your Seedbox credentials on the download client and it will work.
And set up a remote path to link your torrent download directory to whatever directory you store in locally.
Haven’t tried it but i believe it should work something like that.