Source: http://reframe.gizmodo.com/dropbox-carou...

The purpose behind Carousel makes perfect sense. The problem is in execution. Carousel's sharing interface is anything but streamlined. There are just way too many taps and swipes to get through to perform basic tasks. The simple operation of saving a photo from Dropbox to your camera roll requires selecting the photo, swiping up to share, clicking another share button, clicking a flyout menu, then selecting Save. You'll be old by then.