Used to work but doesn’t now – Sketch 3D Review

A few weeks ago it worked fine. Now I get the opening screen briefly which then disappears, leaving me at my iPad desktop. If I swipe up I see it with all the other open apps but there’s no way to actually use it. There is also nowhere to report bugs except in the reviews. Nothing left I can do except delete the app.
Review by gl137 on Sketch 3D.