Yes, this is a lesson on how to copy the Elements of a Picture or an Image and make a Widget to add to your Sidebar or other locations. I hope this answers your question, aikiman.
When you use the "Add Media Tab", these are images that you add to a post or page, to add to a Widget, it's quite different, you have to copy the Element of the Image as I show in the Tutorial.
Actually, you can also copy the Elements of Images in the Media Library and these can be added to a Widget. I hope you understand, aikiman. Take care.