When you upload any text or image document, the Coalition system automatically converts it into a format that can be previewed and shared on the Coalition system.
The following types of file can be previewed when you upload them to your locker:
You can upload other items to your locker, such as sound or video files, but you won't be able to preview them in the Coalition system, or share them with your contacts. However, you can attach anything in your locker to a college application.
You can add almost any kind of file to your locker. You can preview only some files in your locker (text and images), but you can attach any file in your locker to a college application.
See this article for more information on what files you can put in your locker.