Batch edit applies a single edit to a set of photos in one pass, so you can sky-swap or polish a whole listing without repeating yourself. In your Media Library, select the photos you want, choose Batch edit, then pick the one edit to run across all of them. You can batch up to 10 photos at a time.
The batch runs photo by photo and keeps going even if you move to another page. A status indicator keeps you posted while it works, and you are only charged for photos that finish (a photo that fails is never billed).
Each finished photo lands in your library as its own edited entry, exactly like a single edit, ready to download.