Designer unable to open a proof in the Frame Viewer to view markups

After a marketer gives feedback on a piece of creative work, the designer should be able to open that proof and review the feedback and the markups that were made on the proof correct? Today, our designers reported that once they were notified of “Needs Work”, they can’t open the proof. Is that by design? Is there a different workflow they should be following to access that feedback?

We are on Workfront with Adobe Cloud Storage and using the Frame Viewer for unified review and approvals. Any help would be appreciated.