I get some message from website developer.apple.com: "Testers running TestFlight for iOS, version 2.7 or later, and iOS 14 beta or later can test and provide feedback on all available App Clip experiences. Testing of other invocation methods is not currently supported." What's the "other invocation methods "?

Thank you very much. This APIs are just what I want.

The UIAlertController doesn't popup on iPhone XR with iOS 18.0.1 and iPhone 14 plus with iOS 13.6. But the UIAlertController will popup correctly and accept input string on iPhone SE with iOS 17.7. Why is there such a big compatibility issue.