I would also like this feature. I was about to buy a lifetime plex pass assuming that the function would be there but only bought a month luckily. After seeing this two year old thread I think I’ll be looking to find a different media manager as my wife watches a ton of TV shows and I cant be bothered to go delete them all the time.
Make the auto delete function after a show is watched work for the admin and any user that has permissions for that folder to do so please plex. I really dont want to convert to another media manager but this is a pretty simple ask I think.
