Edit: Mona 6.7.3 is now available on App Store on iOS and iPadOS: https://geo.itunes.apple.com/app/id1659154653

(Please avoid installing the iOS/iPadOS version 6.7.2 of Mona, as it is not functioning. I have temporarily removed the app from the App Store. A newer update is on the way, and it will become available as soon as Apple approves it. Sorry for the inconvenience, and thank you for your patience.)