This gives your App Clip target access to Flutter’s
required build settings.

4.2

In the App Clip group’s Info.plist file, set:

Build version string (short) to $(FLUTTER_BUILD_NAME)

Bundle version to $(FLUTTER_BUILD_NUMBER)

Step 5 - Share code and assets

Option 1 - Share everything

Assuming the intent is to show the same Flutter UI
in the standard app as in the App Clip,
share the same code and assets.

Option 2 - Customize Flutter launch for App Clip

In this case,
do not delete everything listed in Step 3.
Instead, use the scaffolding and the iOS add-to-app APIs
to perform a custom launch of Flutter.
For example to show a custom Flutter route.

Step 6 - Add App Clip associated domains