Audio problems in prototype on phones

I have a couple of videos (sound files actually) that work as intended when prototyping on the computer. I cannot get any of them to play when prototyping on an iPhone and only one of them to play when on Andriod.

I saw a post stating they couldn’t get audio to work on iPhones. Is this a current bug/issue?

Thoughts on why only one of three files would be playing on Android?

Thanks for any help you guys can provide!