Hi @Anonymous,
Could you please share a bit more about your issue?
Do you mean that the Camera control captures a blank picture when you navigate back to the screen from another screen?
Based on the issue that you mentioned, I have made a test on my side, and don't have the issue that you mentioned.
The screenshot as below:

Set the OnSelect property of the Camera control to following:
UpdateContext({Counter: Counter+1});
Collect(CameraPics, {Name:"Report" & Counter & ".jpg",ContentBytes:Camera1.Photo, '@odata.type':""})
Set the Items property of the Gallery to following:
CameraPics
Set the Image control within the Gallery to following:
ThisItem.ContentBytes
Please check if you have typed the following formula within the OnVisible property of the screen which contains the Camera control:
Select(Camera1) /* <-- Camera1 represents the Camera control (Camera2_3) in your app */
if yes, please remove above formula from the OnVisible property of the screen which contains the Camera control.
If the issue still exists, please consider take a try to re-create a new app on your side, then take a try with above solution, check if the issue is solved.
Best regards,