Creator - Offline Mobile App (iPhone)

The Creator documentation states "The Zoho Creator mobile app can cache recently accessed Forms, so it is available when a user's device is offline or unable to connect to Zoho Creator." (copied from here: https://www.zoho.com/creator/help/application/offline-mobile-access.html)

But on my iPhone, if I have no Internet connection, my Creator app opens and shows none of my apps. There is a "+" button to add offline apps, but they are all generic stock apps, not MY app. How can this offline feature be enabled for my app? I am paying the Basic plan.