Looks like SmugMug uploader silently ignores videos at the upload stage. It does, however, copy them to the internal cache. Since videos are usually quite large, you see the uploader spending a lot of time and space to do so. It would make sense to either skip videos and warn the user that they are not uploaded, or actually upload them. For now I have to manually drop the videos into the galleries created by PMP with the SmugMug's own uploader...