Inserting a page in the middle is going to be a problem as the annotations are assigned to a specific page, and if you change the underlying pages, the annotations won't be adjusted so they will show up on the wrong page. In that scenario, you would need to first embed the annotations in the PDF (go into the annotations editor, tap the three dots at the top right and then "Embed Annotations"), then edit the PDF with the annotations outside MobileSheetsPro to insert the new pages. I will support editing PDFs in the future as described in other recent forum posts to allow for the insertion of pages and other similar things. When I add support for those features, I will ensure that annotations are moved between pages as needed.
Mike
Mike