I've been struggling to work out how to do this for at least an hour and i'm no further on!
I've backed all my iPhone pics up to dropbox etc., and I now want to delete EVERYthing apart from my special favourite pictures.
I tried sticking them in a separate folder - when I delete a whole day's worth (as you can, in the albums bit) my favourites went as well.
I tried labelling them as favourites with that little blue heart - they went too.
Any neat trick? Essentially what I want to do is go through, mark my 'favourites' and then easily and quickly delete absolutely everything else. Possible??