Applinking & deeplinking with flutter

I’m building a mobile app with Flutter & I would like a link to redirect to my mobile app (if you type youtube.com on your mobile browser it redirects you on the YouTube app if you have it on your phone)

I have edit my android/app/src/main/AndroidManifest.xml file like this :
(I want tu use uni_links)

<activity // default stuff here>
<meta-data
    android:name="io.flutter.embedding.android.NormalTheme"
    android:resource="@style/NormalTheme"
    />
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.LAUNCHER"/>
    </intent-filter>
    <intent-filter android:autoVerify="true">
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <!-- Accepts URIs that begin with https://YOUR_HOST -->
        <data
          android:scheme="https"
          android:host="api.area.baptiste.zip" />
    </intent-filter>
</activity>

And this is the code of the app :

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  StreamSubscription? _sub;
  final params = "null";

  Future<void> initUniLinks() async {
    print("initUniLinks is working");
    _sub = linkStream.listen((String? link) {
      print("listener is working");
      // do something with link
      if (link != null) {
        var uri = Uri.parse(link);
        if (uri.queryParameters['id'] != null) {
          print(uri.queryParameters['id'].toString());
        }
      }
    }, onError: (err) {
      // do something with error
    });
  }

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    initUniLinks();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text("App link demo"),
      ),
      body: const Text("Home Page"),
    );
  }
}

On the flutter doc they say that I have to give acces to a json file so I serve it at this adresse : assetlinks.json & I verify the succes of this file with this google tool : digital asset link

My probleme is that with all this modifications, when I build the APK, install it on my phone and then go on this link api.area.baptiste.zip, nothing appened, I just receive a 404 error.

I also try to lunch the app on my emulator with the command flutter run and then do this adb command : adb shell "am start -W -a android.intent.action.VIEW -c android.intent.category.BROWSABLE -d https://api.area.baptiste.zip/test/?id=123" but nothing append.

https://api.area.baptiste.zip is the root of a NestJS API, I don’t know if it can affect the good workinng of what I want to do.