Cipriux it's for samsung. Happend to me when I got myself sIII galaxy. After installing dropbox app I've recived an email saying "thank you...blah blah... samsung... blah blah you get +48gb for dropbox for two years"
In this copy I just miss one thing that dropbox have, not sure how to call this. In dropbox if you share a link, you can click it and file will download. In copy if you click on shared link new page will open and you have to press download again to download file.
... And you can't drag&drop folders from desktop to Copy. You have to create all foders manually first and then upload files to each folder.