After you sign-in using your Mendeley account (see instructions), you will be able to add annotations to your PDFs and sync them with your Mendeley desktop app.

You library is automatically synchronized every time you open the app.

You can also start a new synchronization with the “pull-to-refresh” gesture on the main documents list (scroll down until the activity indicator appears).

Please note that annotations made with the Mendeley apps are not currently displayed in PaperShip.