One of my personal favorite features of iMessage is that it supports GIFs, the animated images that often lend themselves to pranks, or entertaining responses.
But the problem with iOS and GIFs is the way you have to save them to your device. iOS is capable of saving the animated images, only iOS isn't capable of displaying them in the Camera Roll as animated images. Instead you'll only find a single frame of the GIF displayed as the entire image. Quickly figuring out which images are GIFs and which aren't can be frustrating (especially if you have a lot of memes stored on your device).
Instead of trying to decipher images in the iOS Camera Roll, download the free Dropbox-based app Boxie. Boxie provides a far better user-interface for Dropbox users to organize and view files within a Dropbox account.
One thing Boxie does which iOS or even the official Dropbox app doesn't do, is display GIFs in their true form -- animated. This was brought to my attention by a reader, @KaneHamilton.