Some mobile browsers, especially Safari on iOS, won't let sounds play, especially music, unless the touchscreen is touched.
If that's an issue with music, I'd try adding music files as sound files in your project and treat them as sounds. Might not work, but I remember I wanted to try that out and haven't got a chance yet.
I've tried already, but still no sound. I think it's because of the sound format, that should be mp4, but yesterday I tried to change it to MP4 and now PC runs it but on Iphone it crashes when loading is complete, so I'l redo everything again and test it. Thank you!