Hi Christine and Kim
I have a Moodle course to learn about Moodle 2 and the new features for learning, including an explanation of the new file storage.
It is based on 2.2 but the main concepts are the same. You will need to create an account on the site (or you can download the course from the mooch).
Feel free to use as you want! http://commoodle.southdevon.ac.uk/mod/book/view.php?id=1412