Im using Brave browser on mobile and it's playing videos just fine.
It was being a little fucky by not playing videos in background earlier but it seems to be working again now.
Work in progress bass guitar sound- https://youtu.be/rWj0ZbwTMQU?si=IiqHSLOcy2RaLNaM https://youtu.be/UdKl9R1l9YY?si=bHWWk7oCI9Blt3mj