There are actually two ways to upload files here. You can use the upload button
to upload images. These are simply dumped into an upload folder and you're presented a link to the image, which you use to insert the image anywhere in your post. These images are not managed.
The other option is to attach a file. You can attach several different file types, including image files. Attached files can managed in your user control panel. Let's say you attach a file and then decide not to submit the post. That kind of action can cause a file to become "orphaned". Attachments that are not associated with a specific post show up in the Administrators' admin panel as orphaned files. Orphaned files that are not attached to a specific post are periodically deleted.
I'm currently showing 5 orphaned files..
green-eyeball2.ggr
royal-stewart-stripe.ggr
Logo 1.png
EAN-code.jpg
sunset-1.ggr