The observed behavior is confirmed by DTS: if the PreviewViewController's view is extended to its superview's edges, all UIGestures are consumed and not processed by QL. Potential bypass: Reduce the view's size left / right (e.g. by constrains) to allow some area for swiping. A bug report is filed and will be brought to the engineering team's attention.
A bug report is files and will be brought to the engineering team's attention.
What was that bug number?
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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Take care, Mattes