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. For seamless sharing and syncing of documents, you must use iCloud Drive, iOS 8 on your devices, and OS X Yosemite on your computers.
With iOS 8, you have the option to use iCloud Drive or iCloud Documents & Data. However, if you use Documents & Data on other devices or computers with earlier operating systems after you upgrade your iCloud account to use iCloud Drive, syncing won’t work in all cases. See this Apple Support article for more information.
To use iCloud, you must sign in with your Apple ID in Settings, and make sure iCloud is turned on for Numbers.
Tap Settings on your Home screen, then tap iCloud on the left.
Sign in to your account using your Apple ID, or request a new Apple ID, then sign in.
Tap iCloud Drive (or Documents & Data) and turn it on.
Turn on Numbers.
This setting allows Numbers to store spreadsheets in iCloud.
On the left side of the screen, scroll down to the apps at the bottom.
Tap Numbers, then turn on Use iCloud.
When iCloud is turned off for Numbers on this device, edits you make or new spreadsheets that you create aren’t saved to iCloud, and new or changed spreadsheets from other devices or from your computer aren’t available in Numbers on this device.
Here are a few things to keep in mind about using iCloud to manage your spreadsheets across devices:
If you edit then close a spreadsheet when you’re not connected to the Internet, an upward-pointing arrow appears in the spreadsheet thumbnail. The next time you connect to the Internet, the edited spreadsheet is saved to iCloud.
If you edit a spreadsheet 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 spreadsheet on another device. If you do get a conflict, you can choose to preserve any or all of the spreadsheets you edited.
If you delete a spreadsheet, it’s deleted from iCloud and from Numbers on all your devices.
If you use folders to organize your spreadsheets, the same folder organization applies on all your devices.
If you change the title of a spreadsheet on one device, the title is changed on all your devices.
If you add a password to a spreadsheet on one device, it’s required to open the spreadsheet on all your devices.
In addition to Numbers on your Mac, iPad, and iPhone or iPod touch, you can use Numbers for iCloud beta on the web. Numbers for iCloud beta is a web app you can use to create and edit Numbers spreadsheets using a supported web browser on a Mac or Windows computer. You can access it by logging in to your account on iCloud.com.
Spreadsheets you create using Numbers for iCloud beta are automatically available in Numbers on your Mac or iOS devices that are set up to use iCloud—and vice versa: If you create a spreadsheet using Numbers on an iOS device or a Mac, the spreadsheet appears automatically on the web in Numbers for iCloud beta. See Numbers for iCloud beta Help for more information.
To use Numbers for iCloud beta, you need to upgrade your iCloud account to use iCloud Drive.