So, if a video file had an identically-named audio file (different extension, possibly language code) next to it (e.g. mkv video, mka audio), provide that track to clients as an additional file and present its audio tracks for transcoding, the same way external subtitle tracks are shown.
A request for the same feature exists already, and it has more votes (even though this one here is older).
Therefore this one is closed.
Votes are given back to the users who voted on this request. Please think of re-voting in the other thread if you still want it.
Please search before creating a new suggestion thread.
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https://forums.plex.tv/c/general/feature-suggestions/l/votes