not highlighting

The highlight and underline function do not work on some of my PDFs while the other annotation functions do, and for the life of me, I cannot figure out the difference between the documents where it works and where it doesn't. The (un)functionality id consistent across devices and web v. app. Any idea what's up?
  • edited yesterday at 3:27pm
    Most likely the files just don't have a text layer. You wouldn't be able to select text either. You'd have to OCR them using an external tool.
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