Hi Martin and Brenden,
Many thanks for the replies and sorry for my slow response - just getting back to this problem.
I am using Kentico CMS 7 for this project at the moment so sadly I cannot use the new HTML 5 uploader yet. I am looking forward to switching to this when we port this module to version 8.1+ though.
I am using the direct uploader in a custom modal dialogue that is part of a custom module. It is adding files just fine, but I want to reload the page when the upload completes to show the new files, so I was wanting to find an event to capture.
Kentico support have suggested using the after insert event of the MediaFileInfo object as I am adding files to the media library in this case. This will work fine for single files, but not so well with multiple file uploads I suspect.
Any thoughts on other approaches would be appreciated!