Adjust in increments of 50ms until the dialogue perfectly matches the on-screen action. Security Tips for Downloading Audio Links
Once you have a separate audio file, you need to merge it with the video. This is the most complex step, but it unlocks the full power of VLC. You can do this using free tools like FFmpeg or audio extractor tools on your computer.
Tap the (the speech bubble icon located next to the play button). Expand the Audio track section.
VLC will open your device's file manager. Navigate to the folder where you saved the English audio track.