The Gallery component is used to add multiple images to the page that can be stepped through sequentially by the user. An example of the Gallery component can be seen on the Admissions home page. The Add New Media and Add Existing Media dialogs work the same as with the Image component, except that the Add Existing Media button will allow you to make multiple selections.
Once you have selected the images for the Gallery, you can drag them into the order you’d like them to display using the cross-hair icon to the left of their name.