I know this thread is old, but this feature would be so helpful! We've only been using Workfront for about a year, but we've gotten feedback about update feeds can be difficult to navigate for this exact reason. 

I would love to see this! Another use case: our organization has designers upload deliverables as documents, and then the project managers convert those documents to proofs. So unless PMs download the documents and reupload as a combined proof, we can't leverage this function.