I’ve successfully taken snapshots from my iPhone while riding on my PC, not least during the Trek Factory ride with 250 other Zwifters. The snapshots are saved to both devices.
Today riding in reverse with a handful of riders, both snapshots were blank; black images.
First time I wear the KOM and the Sprint jerseys too. And I clocked 201bpm after the sprint. And SETI might have been interested in that thing in the background.