How can I identify who edited a media file?

We have a number of owners for each group, and sometimes someone else edits a media item (sometimes to edit the file, other times just to change the title field). A group owner was alarmed that the activity story showed she updated a file, when she didn't (she was the original uploader of the file). I tried to find in the Admin panel if there was an activity log that would tell me when someone edited a media file (who was not the original uploader) and I can't find it. I thought this would be easy to track, but it looks like it isn't? Maybe I'm missing something simple.

Parents Reply Children
No Data