Work with stacked photos
You can change the order of photos in a stack, add or remove photos in a stack, split a stack into multiple stacks, and drag a stack (or photos within a stack) to a new location.
Promote a photo in a stack
You can change the order of photos within a stack to help you choose the pick and alternates. Moving a photo to the left promotes it; moving it to the right demotes it.
To promote a photo: Select a photo, then choose Stacks > Promote, or press Command–Left Bracket ([).
To demote a photo: Select a photo, then choose Stacks > Demote, or press Command–Right Bracket (]).
You can also drag a photo to a new location in a stack. When you see a green bar appear, then release the mouse button.
Add or remove photos in stacks
You can add photos to and remove photos from stacks at any time. You can drag photos into or out of a stack, and you can also drag photos from one stack to another.
To add a photo: Select the photos in a stack and the photo you want to add to the stack, then choose Stacks > Stack (or press Command-K).
To remove a photo: Select the photo, then choose Stacks > Extract Item (or press Option-Shift-K).
You can also drag photos into or out of expanded stacks.
Split a stack
You can split a stack into multiple stacks to refine the organization of your photos. All photos remain stacked, but they are now part of new stacks. The photo selected as the splitting point becomes the pick for the new stack.
In an expanded stack, select the photo that you want as the first photo in a new stack.
Choose Stacks > Split Stack (or press Option-K).
Drag a stack to a new location
With the stack closed, drag the stack to a new location in the browser.
The entire stack is relocated.
You can also drag photos into or out of a stack. However, if you drag a photo within a stack into a new project, the entire stack moves to the new location.
When you drag a stack into a webpage album, web journal album, book album, or slideshow album, the entire stack appears in the Browser, but only the stack picks can be used for publication in webpages, web journals, books, and slideshows.