I opened a PDF of about 3000 pages with a few hundred pages of sidenotes and it was fine. Pressed the home button to return to main screen, then back to library and opened the document. The document took a few more seconds than its usual to open, but when I pressed the sidenote icon there was only 1/1 pages and it was empty. Please let me know if there’s something I can do to bring sidesnotes back. It took me almost a year to write these down. Thanks.