[Zubersoft]

Please be aware that duplicating a page in the page order does not actually modify the PDF (which is intentional). So if you have 1-6,6-7, for example, and you modify the first instance of page 6, that's also going to modify the second instance of page 6, because the undelrying PDF itself is being modified when you use snipping tool in the annotation editor (the images have to be saved in the PDF as it would cause massive bloat to try storing them in the database itself). So what you have to do is, on the rearrange pages screen, tap the three dots at the top right and tap "Update PDF with Current Page Order". That will modify the PDF so that it just becomes pages 1-8, and then you can use the snipping tool to modify pages as needed.

As far as the crashes it sounds like the PDF may have been corrupted during the modifications somehow. I would replace the file with the original, follow the above steps, then try using the snipping tool again. Hopefully that will all go smoothly for you, but let me know if it does not.

Mike