For the 4th option (android application to sort photos on phone), last time I looked (about a month ago) unfortunately, there was nothing. Specifically I'm aft

For the 4th option (android application to sort photos on phone), last time I looked (about a month ago) unfortunately, there was nothing. Specifically I'm after something that allows me to keep my photo library on my main PC, in something like adobe lightroom, or picassa, then flag and tag photos on your mobile. There are plenty of photo apps out for android, but nothing to help your organise your primary photo library, if its stored on a PC.