To create a proof of a Dropbox Paper link
In Dropbox Paper, copy the URL at the top of the browser. Or, click the share button at the top right of the screen and select copy link:
In PageProof, click the file dropper icon and select website URL. Paste the URL you copied from step 1 to create your proof.
Note: Dropbox requires uses to be logged out to view the link when embedded as a proof. If you see the Dropbox logo only on the proof, please ensure you’re logged out of Dropbox, then refresh your proofing screen to see the Dropbox Paper.