I see. While not the best solution you could email them to yourself for safe keeping. I tested this by annotating a PDF and emailing it to myself. All annotations show up on the emailed PDF.
https://www.mobileread.com/forums/sh...pdf+annotation
Her are some other suggestions:
https://www.mobileread.com/forums/sh...pdf+annotation
https://www.mobileread.com/forums/sh...pdf+annotation
Someone may still have the program in this thread:
https://www.mobileread.com/forums/sh...light=pdf+word
If someone has it please post a download link.