If you use Dropbox on your iOS devices, pop open the App Store, head to the Updates tab, and grab the Dropbox 3.7 update. It’s a fairly minor update overall, complete with the requisite bug fixes, but it includes the welcome addition of a share sheet extension so you no longer need to switch to the Dropbox app in order to add a file to your Dropbox.
I am unreasonably excited by this addition.
Adding an item to the share sheet is easy to do, but if the Dropbox share sheet extension doesn’t appear right away, open the Dropbox app, then return to whatever you were doing, and the Dropbox extension should show up.