iCloud: Set up iCloud Drive
To turn on iCloud Drive, sign in to iCloud using the same Apple ID on your iOS devices, Mac computers, and Windows computers with iCloud for Windows installed.
Important: 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.
Do any of the following:
On your Mac: Choose Apple menu > System Preferences, click iCloud, then select iCloud Drive.
To automatically store your Desktop and Documents folders in iCloud Drive (macOS Sierra required), click Options next to iCloud Drive, then turn on Desktop & Documents Folders. After you add your Mac Desktop and Documents folders to iCloud Drive, all the files you keep in those folders are uploaded automatically.
On your iOS device: Go to Settings > [your name] > iCloud (or Settings > iCloud), then turn on iCloud Drive. If you don’t have the iCloud Drive app, you can get it from the App Store.
On your Windows computer: Open iCloud for Windows, select iCloud Drive, then click Apply.
After you turn on iCloud Drive, you can work with your files and folders in iCloud Drive on iCloud.com and on your iPhone, iPad, iPod touch, Mac, or Windows computer. See Use iCloud Drive on iCloud.com and Use iCloud Drive on a computer or iOS device.