What are My Media and Media Gallery?
Tufts' version of Canvas uses a video platform called Kaltura for sharing video within the context of a course.
My Media is a collection of all the videos you’ve recorded or uploaded with the Kaltura tools. This is your complete library of videos. It’s associated with your Canvas account, but not with any particular course. Your students in a given course cannot see what’s in your My Media collection.
Media Gallery is the place, within a course, where you can choose and post videos from your My Media collection for your students to view, in the context of the course.