To create an App, you need to create file: Air for Desktop, Air for Android, Air for Ios
Adobe AIR is a cross-platform runtime system developed by Adobe Systems for building desktop applications and mobile applications, programmed using Adobe Animate, ActionScript and optionally Apache
In other words it's the framework that makes Apps created with Adobe work
This process varies by phone (Android/ios), Computer and versions. Check most recent tutorials and instructions
IOS requires a certificate from the Apple store, but Android will allow apps to be published directly to the phone for testing purposes
The Flash publishing IDK is very unreliable so you might want to check out other dedicated resources
Here is an example tutorial:
Or you can try third party UI tools such as: AppsGeyser