You were right!
I hit manual import and set it to “copy.” Checking inum confirms that it did hard link the data, leaving the torrent intact.
Thanks for your help. I wonder if a tooltip would be helpful on manual imports to let people know to choose copy if they want hard links.
(“Show name” redacted from following commands)
Get the inum for a random episode currently hosted on Sonarr:
gtwy@rocinante:/storage/media/TV/The Show/Season 01$ ls -ilh *.mkv | grep S01E08 146145283 -rw-rw-r-- 2 tor tor 8.7G Mar 21 13:49 S01E08.Bluray-1080p.x264.DTS.The Call of the Wild.VietHD.mkv
Check to see if a file with the same inum exists in the torrent download folder:
gtwy@rocinante:/storage/media/Downloads/The.Show.2016.1080p.BluRay.DTS.x264-VietHD/$ find ./ -inum 146145283 ./The.Show.2016.S01E08.1080p.BluRay.DTS.x264-VietHD.mkv