Although I understand the symbols that indicate local and cloud status of files on your local dropbox folder. I still make the mistake of copying files and later realizing that they have zero bytes, and then I have to go back and turn the files into local before copying. And less experienced users, do not even understand this. The logic of being able to copy cloud files with no warning that you are actually not copying anything is beyond me. Please, send up a warning dialog that allows you to make the files local whenever you try to copy cloud files. You shouldnever allow zero byte data to be copied.