Refreshing Gallery Document Viewer?

I faintly remember seeing someone else had asked this previously, but no combination of word searches is getting me where I need to go.

A user uploaded a file to the gallery. They have since made a minor modification to the presentation and have replaced the file, so the download works perfect. We're trying to figure out how to get the document viewer window to also refresh without entirely removing the gallery entry and re-doing it.

Any suggestions?