In addition to attaching via the link icon, the "Description" type will also let you add a picture or media file, or any combination of all three.
In fact, just trying this out gave me the idea of how to do something that comes up in the forums on a regular basis, namely "How can I make sure some one watches or listens to a audio/video presentation."
If you have a video or audio podcast in a Description as the first thing in a quiz, you can have questions right underneath, that they have to answer which could be used as proof they watched and/or listened. You could also set time limits, number of attempts, etc.
The questions could even be set to be drawn randomly from a question bank to help prevent passing around the answers.