Xcode 5 organizer had a view which would list all the crash logs. and we could drag drop crash logs here. But since Xcode 6, I know they have moved devices out of organize a
Make sure that your Xcode application name doesn't contain any spaces. This was the reason it didn't work for me. So /Applications/Xcode.app works, while /Applications/Xcode 6.1.1.app doesn't work.