If your decks don't appear on your iPhone/iPad:

• Pull down on the list of decks, then wait for a few moments and check again for the decks from iCloud to appear.
• Turn both, Mac and iPhone/iPad, completely off and back on again.

Check the settings:

1. Tap on ⓘ in the top left of the list of decks and confirm that “Use iCloud” is turned on.
2. Go to Settings (iOS) and System Preferences (Mac) → iCloud and confirm that “iCloud Drive” turned on on both devices.
3. Check on your Mac that your decks are saved in iCloud Drive in the folder “Flashcard Hero”.
4. Make sure that you are connected to the Internet on your Mac and iPhone/iPad.
5. If iCloud Drive is activated on at least one of your devices, all other devices must also use iCloud Drive (instead of “Documents & Data”). iCloud Drive was introduced with iOS 8 and Mac OS X 10.10 Yosemite.