Your contacts are able to share any documents in their locker or their college list with you. To see what documents or college lists are shared with you:
1. From the main navigation, select Home> Contacts.
2. All your contacts are listed. Any media or college list shared with you is listed in the row with their name.
3. Click or tap the "item(s) shared" text to see any items the contact shared with you.
4. Select any item to open it for reading and commenting.
For more about how to collaborate and give feedback on a shared document, see this article.