Dolby Atmos not Starting

I have some Dolby Atmos 7.1 demos that play fine on my Apple TV 4 (7.1 only, no Atmos), but when I try to start them on my iPhone, they don’t start at all. They just hang at 0:00. This happens for all the Atmos demos I got from here (except “Unfold”):

Hmm, thanks for pointing that out.

We’ll take a look.