How do I properly rename my SRT files?

So all my English subtitles have the filename.srt format. However when I play a plex movie instead of “English” subtitle it displays it as “Unknown SRT” Where and how can I rename that?

The file name needs to include the language as part of the file name, for starters.

Example:

A Perfect Murder (1998).mp4
A Perfect Murder (1998).eng.srt

And this worked great for me.

There might be other things involved, like encoding, etc. but this works for most of my subs.

Additionally, there is a support page that covers this as well
https://support.plex.tv/hc/en-us/articles/200471133-Adding-Local-Subtitles-to-Your-Media