Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
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Okular supporting annotating PDF pages but does not supporting adding/removing PDF pages.
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Okular supports rotating all pages of the whole PDF file but does not support rotating a single page (unless the whole PDF file has a single page) .
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you must hold the ctrl key in order to click and drag pop-up notes to move it