I have the same question- I would love to adopt PencilKit, frankly because my drawing algorithm *****. That said, i'd need to load my current markup image into the PKDrawing in order to convert from one method to the other without losing all the user's work. I don't want to just place it behind the drawing as a layer, as they wouldn't be able to erase things.
davepeat
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I still can't find this mentioned anywhere else, but one of my customers discovered that if you use 3 fingers to tap instead of long-pressing one finger, you get an edit menu at the top of the page, with Paste as an option. I've logged a bug with Apple, but they haven't responded and it's been about two months.