See Settings > [Server Name] > Library > Video play completion behaviour
Decide whether to use end credits markers to determine the âwatchedâ state of video items. When markers are not available the selected threshold percentage will be used.
With TV series on the plex server (accessed via Firesticks), I sometime end an episode a minute or two prior to the ending credits. Upon returning, the server has already advanced to the next episode and it is a pain to get back to the last two minutues. It would be nice to define (i.e. in seconds) the point the server should automatically advance to the next episode.