Rename your audio file exactly like your video file (e.g., Movie.mkv and Movie_Hindi.aac ). This helps MX Player auto-detect it.
Save the audio file in the same folder as your video file for convenience. How To Download Hindi Audio Track In Mx Player
Once you have both your video file and your standalone Hindi audio track stored on your device, follow these steps to play them simultaneously: and navigate to your video folder. Play the movie that you want to watch. Rename your audio file exactly like your video file (e