MP4 Videos do not play in the Background

Wappler shows the animation live. See below:

Screen Shot 2021-01-30 at 5.43.24 PM6158×3342 1.8 MB

This is what it looks like when selecting view in browser or selecting the QR code.

Screen Shot 2021-01-30 at 5.43.49 PM3762×2106 261 KB

What is missing?