Roku subtitles DON'T WORK

Server Version#: Latest
Player Version#: Latest

Synology NAS server, latest DSM
Roku with Plex player, latest version

Playing a movie, I select subtitles, after 5 seconds they stop working…PLEASE FIX THIS !!!

How so?
Subtitles never show after those 5 seconds or never at all?

Mind sharing some information:

  • is this about internal/external/on-demand subtitles?
  • with what type of subtitles are you experiencing this?
  • do you experience the same problem when using a different player (e.g. Plex Web, desktop apps)?