If Notability can't connect to iCloud, these ideas may help.
1. Restart all devices.
2. Turn Notability off and back on in iCloud Drive for all devices.
- Close Notability on all devices.
- iOS: Double-tap the home button and swipe up on Notability.
- Mac: Press ⌘Q while in Notability.
- Turn Notability off in iCloud Drive on all devices.
- iOS: Under "Settings > iCloud > iCloud Drive", turn Notability off.
- Mac: Under "System Preferences > iCloud > iCloud Drive > Options", uncheck Notability.
- Restart all devices.
- Turn Notability on in iCloud Drive on all devices.
- iOS: Under "Settings > iCloud > iCloud Drive", turn Notability on.
- Mac: Under "System Preferences > iCloud > iCloud Drive > Options", check Notability.
- Turn iCloud on in Notability on all devices.
- iOS: Under "Notability > Settings > iCloud", turn iCloud on.
- Mac: Under "Notability > Preferences", turn iCloud on.
3. Log out of and back into iCloud on all devices.
- Log out of iCloud on each device.
- iOS: Under "Settings > iCloud", tap "Sign Out".
- Mac: Under "System Preferences > iCloud", click "Sign Out".
- Restart all devices.
- Log in to iCloud on each device.
- iOS: Under "Settings > iCloud", sign in.
- Mac: Under "System Preferences > iCloud", sign in.
- Turn iCloud on in Notability on each device.
- iOS: Under "Notability > Settings > iCloud", turn iCloud on.
- Mac: Under "Notability > Preferences", turn iCloud on.
4. See if syncing is prohibited.
If your iOS device is managed by an organization like a business, iCloud syncing might not be allowed. To check, go to "Settings > General" If there is a "Profiles" button, tap it and look for a policy that says "Documents in the cloud not allowed".