Report: OneDrive placeholders may return in WIndows 10 ‘Redstone’

OneDrive in Windows 8.1 had a handy space-saving feature called Placeholders. With Placeholders, you would be able to access any file on your OneDrive by double-clicking an icon as you normally would, but the file itself wouldn’t actually be downloaded to your PC until you opened the file. Check this article from PCWorld.com