The subtitle feature in Plex is usually great, however it could greater if it had a download component for .srt files.
Would you mind elaborating what you’re looking for?
There’s on-demand subtitle search.
I’m looking for Mission Impossible (1988). There are two files available but they don’t sync with the dialogue with the files I have. I have the .srt files for the files.
You can store the SRTs alongside your media files, name them accordingly and refresh the movie‘s metadata for Plex to pick them up.
https://support.plex.tv/articles/200471133-adding-local-subtitles-to-your-media/
2024 clean-up: abandoned, considered to be implemented