Some videos work best when accompanied by extras. You can add anything as an extra—pdf, jpg, word document, etc.—so the customer would download and use it along with the video.
For example, maybe you are teaching a class, and you want your students to have assignments to complete. In order to offer extras with your class, you will first upload extras in Uscreen, then add them to videos so that the extra will appear under Resources on the video page.
Navigate to Content > Videos and click Edit on the video you want to add extras to. Under the Extras tab, click Choose File to add extras. Then Save the change.