1. Open the `unity` project and build it: Menu -> Flutter -> Export iOS
Be sure you use at least Unity version 2019.3 or up.
2. open ios/Runner.xcworkspace (workspace!, not the project) in Xcode and add the exported project in the workspace root (with a right click in the Navigator, not on an item -> Add Files to "Runner"-> add the UnityExport/Unity-Iphone.xcodeproj file
<imgsrc="../workspace.png"width="400"/>
3. Select the Unity-iPhone/Data folder and change the Target Membership for Data folder to UnityFramework