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I'm not able to connect my EOS R to my iPhone 12 Pro Max using a USB cable. I didn't have this problem with my 70D, which connected immediately. 
This is a question that should be easy to answer but I cant find an answer anywhere. Using my 70D in manual mode when I adjust the shutter speed and f stop, the mark below the meter should move. It doesn't. No matter what I do it remains on -3. auto ...