Server Version#: 1.20.1.3252
Player Version#: 8.6.0.20351
Videos using the multiple parts feature in Plex to not continue to the 2nd part on Android. When you get to the end of the first part, it just kicks you back out to the information screen about the video. The total time for the video is correct and shows the right files. Basically, the same issue as this thread from years ago: Stacked Movie Parts not playing in Android?
I had the same problem and finally decided it was a lot simpler to combine the the video files into one. I didn’t have that many and a single file plays without the little pause where you kind of wonder what’s going on.