For PDF documents that are pending in your Workflow Request List (located in your 'Workflows' or 'Approvals' tab), you can refer back to Annotations on previous Versions submitted during the approval process to ensure the latest submitted version covers all the requested changes.
To do so; locate the relevant PDF file listed in the Workflows menu.
Locate Actions on the right hand side of that file. Click into the small downward arrow to reveal the action menu, and select the Reader from this menu.
In the Reader view you will see a Versions menu up the top left hand side of your screen.
Clicking the Versions menu will reveal all versions of the file.
Click into the relevant version/s to review mark-ups, comments, notes, as required.
Note: This feature currently only applies to PDF documents in the Reader mode. Accessing Images that have the annotations enabled is coming soon.
* Please note that some of the terms used above such as Workflows & Approvals are customisable and may appear differently in your platform.