When you add clip media within the Clip Organizer, you need to select an existing Collection. There are some prerequisites though — you can only add your own media to the My Collections folder, or any Collection you create as sub-folders with the My Collections folder. A Collection is just like a folder in which you save files — taking the folder analogy further, you can also create Collections within the My Collections folder. Later you can rename, move, and delete a Collection altogether.
Learn how to create and organize collections in Clip Organizer.