I saw the comment:
In my case, I have edits that I don't want to lose, but I do have a few pages at the end of the PDF that I would like to delete because I included them in error. I have NOT done any annotations on those pages."The PDF editing features are accessible by selecting the minus sign or the plus sign indicated by the arrows below. This feature is best used prior to manipulating a PDF. If you have added notes, drawings, metronome settings or midi settings, the PDF editing features will not be available for that PDF."
I'm guessing I could use that Set Sharing feature which includes notes on exported PDFs and then reimport the annotated PDF after I lop off the trailing pages using Preview on the Mac. The problem is that the PDF is an extremely low quality scan to start with. Will the Export/Import process re-render the PDF in a way that may lower the quality? If so, it won't be worth it for me to go that route.
Thanks in advance!