How to add specific language audio to files/library

Hi, new to the forums. Does anybody know if there is a way that I can add 1 specific audio track (Spanish audio) to each of my media files (movies) in my library? It’s not already embedded in each file, so i wonder if there is a way to quickly get an audio track for a movie file that’s in another language and then add it to each movie in my library. I heard about MKVToolNix, but the server is down and even then, I would need a program that searches and catalogs my files, finds the audio file I would need, acquires it, and then I would need to add it to the library. Kind of like how subtitles work, but for audio files.

Like for example;

Avatar (2009).mkv
Avatar (2009) (Spanish Audio).mp3

Like that?

i believe so, the movie file itself has 1 audio file already embedded i assume and i would like that .mp3 file you listed show in the audio selection pulldown. I need this available for each movie file.

How many movies are we talking about? 10? 20? 100? 1000? 10000?

There is no way to do that in Plex. You would have to use a separate muxing program to embedded the track info a file like mkvtoolnix

A little over 1000

Can you PM me the complete list of filenames(movie & audio)

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