After the Trial period has expired a subscription is required to use the premium features of the App.
Please Register your Subscription.
Let me repeat that - Please register your subscription.
If the Subscription is not registered I can’t see it. And therefore I can’t restore it.
The subscription is purchased from Apple, Google or Microsoft. They do not share customer information.
As long as you keep the App on a device that is not restored and the App is not deleted you are OK. But if you restore your device or re-install the App you might not be able to get the subscription back if it has not been registered.
Also if you want to use the subscription on a different device it has to be registered so it can be restored on the new device.
Piper PA-28-160 Warrior N4325V
South of Bluemont, VA