Okular 0.20.2 on Ubuntu 12.04, I made some annotations to a PDF file and when I try to save a copy of it with
Save as (to preserve the annotations), I get the message:
Your annotations will not be exported. You can export the annotated document using File -> Export As -> Document Archive
I'm not sure why this happens since Okular should be able to save annotations since version 0.15.
That same page says something about how
Okular should have been built using
Poppler version 0.20 or later, but I'm not sure how to check this.