Syncing Flashcard Max from Mac to iPhone

I've downloaded Flashcard Max from the App store to both my Mac and to my iPhone.

Next, as a test, I created 20 flashcards on my Mac but I can't find a way to sync the cards I've created on my Mac to my iPhone.

A Google search suggested that the App on both devices should be synced to the iCloud but I don't think that's possible.

This is potentially a fantastic app for me but it's about as useful as a chocolate kettle if I can't sync the data to my iPhone!

Any help gratefully received.