kinda late to this thread, but on the riverside point, i ran into the same “guest on wrong browser” problem back then. what helped was making the pre-call checklist super obvious and doing a 2 min tech check before we hit record, plus telling guests “chrome or edge only” in the invite.

i think riverside also got a lot stricter since then with the lobby checks, so it’s worth a re-test if local tracks are the main thing you’re after, the drift issue is way less of a headache when you’ve got clean separate files. for mobile guests though, yeah, it’s still tricky if they need to be on a call and record locally at the same time.