Syncing is not automatic. On the device you want to use as the data source, tap Create Backup. Then, on the device you want to transfer the data to, tap Restore from Backup. This syncs your data.
If it does not work, please check the following.
- Open the Settings app, tap your name at the top, tap iCloud, and make sure you have enough free iCloud storage.
- Make sure the app is updated to the latest version on both devices.
- Delete the iCloud backup once, create it again, and then restore it.
- Restart your devices and try again.
- If it still does not work, open the Settings app, tap your name at the top, then tap iCloud and turn off iCloud Drive. Turn it back on, wait five minutes, reopen the app, and check the iCloud backup screen.
If none of these help, please contact us from the Contact Us button in the upper right and let us know at which step you get stuck. Thank you.