Apple Pencil Mark-ups on pdf not saving
Hi. I have been using my Apple Pencil to mark-up PDFs on my iPad Pro. Never had an issue until yesterday. Now, when I save or email the PDF, the mark-ups disappear. Have updated to latest IOS 15.3 but that didn't fix the problem. Normally, I would open the pdf from email, do the mark-ups, hit "Done" and "Reply All". When that didn't work yesterday, I tried saving the marked-up PDF to Dropbox and Cloud Drive but same problem. The first page saves, but the mark-ups disappear from the following pages. Any ideas how to fix?
iPad Pro 11-inch Wi-Fi