When taking screenshots in Zwift on Mac or PC, it saves 2 images - a regular screenshot and a “clean” version without the HUD. If you take a screenshot with the companion app, you only get the regular version. You can upload clean versions when you save your ride, but you’re limited to 5 shots and the shots that are saved on the device are all still with the HUD.
It would be great if screenshots taken with the Companion app behaved the same as on Mac/PC.