Hi, I've recently bought a Nexus 7, and am loving my first taste of android having been heavily into iOS devices previously. Its taken a few weeks to get used to how it works but one simple thing is bugging me and am hoping there is an easy solution that someone can give me. I want to change the thumbnail picture displayed in the gallery app (I'd call that the 'key photo' from using apple products in the past). It seems to default to the first images in a particular album, I've tried various taps and swipes and looking in the app and album settings but can't find anything. Am I missing something really obvious? I know this is a minor issue but would be great if I could find a way to change it!