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What annotation options are there in PDF files?

While viewing the file you can make comments and respond to the given comments. You can also highlight and strikethrough the text and compare file versions with each other.

There is also an option to find a phrase or a word from the document using the search icon. Highlight all words, match case or match whole word and jump between the next and previous searched word. Jump directly to a page you want by typing the page number directly in the PDF page number box or switch to presentation mode by clicking the full screen icon.