I've just got a new iPhone 12 mini. When I open up the camera, I can see an image on the screen and, when I press the round white shutter button, it makes the noise iPhones make when they take pictures. But no picture is actually taken and no small image appears in the bottom left hand corner of the screen. But when I take a screenshot, I record an image on the camera with no problem. I suspect this is a settings problem rather than a hardware problem. I have already done a full restore and that didn't solve the problem. Help, please!