iCloud: iCloud Drive overview
With iCloud Drive, you can safely store all kinds of documents in iCloud, and access them on iCloud.com and all your computers and iOS devices. If you like, you can have all the files in the Desktop and Documents folders on your Mac stored automatically in iCloud Drive (macOS Sierra required). That way, you can save files right where you usually keep them on your Mac, and they become available on iCloud.com and all your computers and iOS devices.
You can also use iCloud Drive on iCloud.com. From a web browser on a Mac or Windows computer, you can upload and download files, delete files, organize files in folders, rename files, and restore recently deleted files.
Important: After upgrading to iCloud Drive, your documents stored in iCloud Drive are only available on your computers and iOS devices that meet minimum system requirements, and have iCloud Drive turned on. Your documents in iCloud Drive are also available on iCloud.com.
If you have devices with iCloud Drive turned off, documents and data on those devices aren’t kept up to date with documents and data on your devices with iCloud Drive turned on.