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Carousel from Dropbox is even easier than your regular messenging app for sending photos while you chat with friends.
Use the button on the right of a set of pictures to quickly select them as a group.
As you browse, you can drag individual images to the top. When you've selected all the photos you want, you can share them as a group.
Carousel organizes groups of photos in a grid to save screen space. Touch a photo to see it zoomed in, then swipe left or right to view the rest of the photos in a group.
When your friend sends you photos, a button shows up that lets you save them to your Carousel.