There’s an issue with the default standalone for iOS, starting with iOS 12. (I haven’t tried it with desktop.) The “unmute input” button doesn’t draw. It works, if you tap in the correct place, but you can’t see it. I can’t for the life of me figure out why, because the code seems correct.
It’s not that big a deal for us, as I use our custom standalone, but I feel this will be mighty confusing for new people.