You may upload videos, images, documents, slide presentations, and audio files into Open Author. Additionally, Open Author is built to handle videos straight from YouTube and TeacherTube, as well as pictures from Flickr. Just copy the link to video or picture hosted on one of those sites and paste it into the media upload tool - the media will display inside of your resource!
Note: only upload media that you have permission to reuse.
For more detail, please see Adding Media