iCloud stores your documents and keeps them up-to-date across your iOS devices, the web, and your computers. You always have the latest versions at hand, no matter which device you used to make your latest edits. With OS X Yosemite, you use iCloud Drive to access your documents on iCloud.
If you’re using older versions of Pages and OS X on other computers, or haven’t upgraded your iOS device to iOS 8, syncing won’t work in all cases. You must use iCloud Drive for seamless sharing and syncing of documents. See this Apple Support article for more information.
Open System Preferences on your Mac, then click iCloud.
Sign in using your Apple ID, or request a new Apple ID and then sign in.
Select the iCloud Drive checkbox, then click Options.
Select the Pages checkbox, then click Done.
Here are a few things to keep in mind about using iCloud to manage your documents across devices:
Before you can share a document in iCloud, you need to save or move the document to iCloud.
If you edit and then close a document when you’re not connected to the Internet, you see “Syncing” below the document thumbnail in the Open dialog on your Mac. The next time you connect to the Internet, the edited document is synced to iCloud.
If you edit a document on more than one computer or device before your edits are saved, you will see conflicts. Make sure the app has had time to save your changes to iCloud before editing the same document on another device. If you do get a conflict, you can choose to preserve any or all of the documents you edited.
If you delete a document, it’s deleted from iCloud and from Pages on all your devices.
If you use folders to organize your documents, the same folder organization applies on all your devices.
If you add a password to a document on one device, it’s required to open the document on all your devices.
In addition to Pages on your Mac, iPad, and iPhone or iPod touch, you can use Pages for iCloud beta on the web. Pages for iCloud beta is a web app you can use to create and edit Pages documents using a supported web browser on a Mac or Windows computer. You can access it by logging in to your account on iCloud.com.
Documents you create using Pages for iCloud beta are automatically available in Pages on your Mac or iOS devices that are set up to use iCloud—and vice versa: If you create a document using Pages on an iOS device or a Mac, the document appears automatically on the web in Pages for iCloud beta. See Pages for iCloud beta Help for more information.
To use Pages for iCloud beta, you need to upgrade your iCloud account to use iCloud Drive.