Just to add to this, there IS an edit option on the Proofing Viewer,
which has led to some confusion for our users in the past, because
they'll edit their comment on the Proof, but their original comment
remains on the Updates tab of the document, with no indicator to let
people know it's outdated (and the new edit never shows up in Updates
either). The worst case caused one of our designers to do almost double
the work because the original comment was drastically different from the
edited one, ...