This post is from the Activity iPhone Duo UIKit Q&A.
"For QR scanner functionality on Apple Duo:
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Should QR scanner remain accessible during fold, or should it be disabled?
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If fold occurs during active scanning, what happens to the scan session?
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Should we use one camera or dual cameras on both screens?
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How do we handle camera permission state across fold transitions?
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Should scan result be displayed on the screen where the camera was active?"