I'm using a Galaxy Nexus with Android 4 and I'd like to move files between the Pictures folder and my Dropbox (or just around the phone in general). I'd also like to set the camera to save pictures directly to the Dropbox when WiFi is available.
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Just install dropbox, create a new account if you don't have one already and watch the tutorial. It's very straight forward. I only upload camera pics when my phone is charging but then again I have a spare samsung charger and 4 brand new batteries lol.
In both the android devices configure Google Play with the same Gmail ID. Then in your Google Play account purchase list you will have list of all the apps that you have downloaded till date. Just plug the required device and download the app that you require to the device you desire.