When uploading a document, you can request a document approval. This is great!
But, you can't assign a deadline to the document approval.
We have some projects in which we just want a user to approve a document, without assigning them a formal request. Workfront allows this, but without a due date, there's no way to indicate to the user by when their approval is needed. The workaround is to indicate that detail in a directed update, but this results in the user receiving two email notifcations (one soliciting approval, and another with the directed update.)
Document approvals should have deadlines just as request approvals do.