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This gallery view lets you scroll through all the photos in a folder (galleries are only created if they're in a subfolder of the Dropbox Photos folder. You get a different view (and the ability to get a link) if you click to open a photo file directly from the file listings. That view doesn't include the row of navigation thumbnails shown here.
Dropbox is pushing its photo features hard, offering free, automatic storage upgrades if you upgrade lots of photos.