When comparing TransIP Stack with Dropbox I must say that Stack has a great feature photo viewing feature for browser and mobile app. Photos are sorted by the folder they are reside in, starting and the top level parent folder that you can drill into. This is a much better option than viewing photos timeline based. Specially with a large number of photos (1000+ which most of us have these days) timeline viewing does not allow you to find images easily and forces the user must scroll in a way that is not user friendly.
My urgent request for dropbox is, please take a look at how TransIP Stack has implemented this feature and give Dropbox users the same.