Automatically load local subtitles for easy viewing

Plex Players
1

When playing videos, local subtitles can be automatically loaded for easy viewing. Options can be added to choose whether to automatically load local subtitles

2

https://support.plex.tv/articles/200471133-adding-local-subtitles-to-your-media/

https://support.plex.tv/articles/204985278-account-audio-subtitle-language-settings/