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I cannot save a PDF that I highlighted. The first message that I get is:
The file may be read-only, or another user may have it open. Please save the document with a different name or in a different folder.
Then after trying to save it: The document could not be saved. A file error as occured
I need my highlights and I would like to not lose them. This has already happened to me. I have a Macbook pro 2014.
Acrobat Version 2021.001.20135
Export them as an FDF file. Then close the PDF without saving. Then open it again and import the comments.
I have the same problem as the OP, using Adobe Pro DC on a Mac. I don't have an option to export as an FDF file - at least, not in the File, Export As menu.