This may be related to @trichome's bug report here. If I upload two or more attachments and click Thumbnail or Full Image under Insert every image as a..., only the first image will be inserted and I have to click one of them again to insert all attachments. Then of course I have to manually delete the first one because it inserts a duplicate of the first one. I can make a video if necessary. Edit: Browser is Mozilla Firefox 27.0.1 and operating system is Windows 7.