umm Is it read only? (windows explorer, RMB on the file go to properties (uncheck read only). Thats how I was able to reproduce your issue. Oh and I believe you will find that nothing you edit on a PDF will get updated/shown in Inventor. Its like Inventor doesn't recognize any of the editing (sticky notes, text edits, highlights,etc...) functionality of PDF files.
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Inventor 2023 - Dell Precision 5570
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