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I do have several movies (and tv shows) that have mor ethan one language.
Therefore I used this guide https://support.plex.tv/articles/naming-and-organizing-your-movie-media-files/ to name the files and I got something like
/Movie {tvdb-12345}/
Movie.mp4
Movie.en.m4a
Movie.es.m4a
Movie.en.srt
Movie.es.vtt
Whereas the movie itself sometimes has no audio track embedded in the mp4-container, sometimes it does. the m4a have aac-encoded audio tracks. The subtitels are working perfectly and in all players I use (iOS app, Apple TV App, Android app, webbrowser) I can select or disable them.
But plex shows me no audio track at all when they are in a separate file. What am I doing wrong?