ok… couple things to note.
Subs need to match file name, adding a language before the extension.
So “My Movie (2020).mp4” would have subs “My Movie (2020).srt” but would show up as unknown. so add the language to the filename… like “My Movie (2020).eng.srt”
I ran into an issue recently and eventually figured out that my subs had non-standard attributes in the file that was causing it not to render, it work for some players but not others… then eventually didn’t work on all players. Once I deleted the offending lines in the subtitle file, it worked.
If you can, post the subtitle file to examine.
Good luck,
-End
