Any content within Sway needs to be within one of the three Card categories: Text, Media and Group. As far as Group Card types are concerned, they are essentially a group of some combination that can include the Text and Media Card types. As long as you have the Card types and numbers that are a prerequisite for a particular Group Card type, you can change from one Group type to another.
Learn how you can change from one Group Card type to another within Sway.

