All video files can have external subtitles. The file name must match the video file name, or be suffixed with a language.

/Movies
   /Home Alone (1990)
      Home Alone.mkv
      Home Alone.srt
      Home Alone.spa.srt
      Home Alone.spanish.srt

Default Subtitles

External subtitles can be marked as default using either ".default".

/Movies
   /Home Alone (1990)
      Home Alone.mkv
      Home Alone.srt
      Home Alone.spa.default.srt

Forced Subtitles

External subtitles can be marked as forced using either ".forced" or ".foreign".

/Movies
   /Home Alone (1990)
      Home Alone.mkv
      Home Alone.srt
      Home Alone.spa.forced.srt
      Home Alone.spa.foreign.srt

Subtitles can be downloaded from Open Subtitles.