Amazon Cloud Drive is now available to download on your Windows or Mac desktop. Sadly Amazon's app doesn’t support syncing or a native desktop browsing client – like rivals Dropbox, Google Drive, and SkyDrive.
You can simply upload files to your free 5GB online by dragging them into the Amazon Cloud Drive icon for background uploading. If you’re paying for space (up to 1TB) then all your music storage is free. So if you’re interested check out Amazon for more details and downloads.