Verify that your browser can access this file.

Testing

Note:
  It might take up to 24 hours before Apple’s
  Content Delivery Network (CDN)
  requests the apple-app-site-association (AASA) file from your web domain.
  The universal link won’t work until the CDN requests the file.
  To bypass Apple’s CDN, check out the alternate mode section.

You can use a real device or the Simulator to test a universal link,
but first make sure you have executed flutter run at least once on
the devices. This ensures that the Flutter application is installed.

If using the Simulator, test using the Xcode CLI:

Otherwise, type the URL in the Note app and click it.

If everything is set up correctly, the Flutter application
launches and displays the details screen:

Appendix

Source code: deeplink_cookbook