File uploads need to be controlled on the server and is not currently implemented for the quick upload. Part of the reason I haven't implemented the Quick Upload yet is because I'm investigating ways to make a custom image upload that can be used in all the editors. Also the quick upload doesn't give the user and choice about where the uploaded file is located.
You can upload images by clicking the browse server button which gives choices of where to upload the image.
Hope it helps,
ps when posting related to a previous post please don't start a new thread, just reply to the one you already posted.