Once you have downloaded the English audio file to your phone, follow these steps to play it with your video:
You downloaded a version that only contains the regional dub. BETTER Download English Audio Track For Mx Player
Before downloading files, it helps to understand why the audio isn't working as expected: Once you have downloaded the English audio file
If you want to save this pairing permanently, you can use the "Save" option within the Audio menu so MX Player remembers the track for that specific video file. BETTER Download English Audio Track For Mx Player