Save multiple photos from iPhone camera roll to dropbox
This has always annoyed me, that Dropbox does not allow you to save to your Dropbox from within the photos.app. Grr...

And from time to time I (re-)discover how Dropbox wants you do do this:


Open Dropbox
Tap the "+" button labelled "Create"
Tap "Upload Photos"


...and you will be presented with your camera roll, and if you scroll up, the rest of the pictures on your iPhone. You can now select as many as you want.

I've often hated on the way Dropbox does this as it is intuitively backwards but if you can do better than me and remember this "trick" you should be good to go.