Think the thumbs up / down is linked into instant mixes, rate something up for more tracks like it, down for something different. Only got two tracks rated in my library (and I'm not really sure why I rated them in the first place), so it doesn't really bother me!
Once you've selected the files you want on your device you should get a notification saying keeping selected music with a progress bar, seemed to take a fair while when I did it, although it was over a relatively poor internet connection.
Think the thumbs up / down is linked into instant mixes, rate something up for more tracks like it, down for something different. Only got two tracks rated in my library (and I'm not really sure why I rated them in the first place), so it doesn't really bother me!
Once you've selected the files you want on your device you should get a notification saying keeping selected music with a progress bar, seemed to take a fair while when I did it, although it was over a relatively poor internet connection.