I have multiple devices (both Android and IOS) subscribed to same topic (e.g. “all”/”unregistered”)
I am sending FCM notification through postman,
I am able to successfully able to receive notification on all devices, but when I add image url to notification all devices receive notification but some devices are showing notification image.

This is my Json for sending notification from postman

{
  "to": "/topics/all",
  "notification": {
    "body": "Notification Body Content",
    "title": "Notification title content",
    "image": "https://images.pexels.com/photos/1108099/pexels-photo-1108099.jpeg",
    "sound": "default"
  },
  "apns": {
    "headers": {
      "apns-priority": "10"
    },
    "payload": {
      "aps": {
        "content-available": 1,
        "sound": "default",
        "alert": {
          "body": "Notification body",
          "title": "Notification title"
        }
      }
    }
  },
  "android": {
    "priority": "high",
    "notification": {
      "sound": "default"
    }
  },
  "data": {
    "goToScreen":"",
    "redirectionUrl":"",
    "redirection": "1",
    "redirectToExternalApp": "0",
    "redirectInsideApp": "1"
  }
}

below is the code that I used to handle notification

filename : notification_utils.dart

class FCMServices {
  static RemoteMessage? initialMessage;
  static String? messageId;
  static FirebaseMessaging messaging = FirebaseMessaging.instance;

  static Future<void> requestNotificationPermission() async {
    // Request notification permission on IOS
    if (GetPlatform.isIOS) {
      NotificationSettings settings = await messaging.requestPermission(
        alert: true,
        announcement: false,
        badge: true,
        carPlay: false,
        criticalAlert: false,
        provisional: false,
        sound: true,
      );

      if (settings.authorizationStatus == AuthorizationStatus.authorized) {
        // print('User granted permission');
      } else if (settings.authorizationStatus ==
          AuthorizationStatus.provisional) {
        // print('User granted provisional permission');
      } else {
        // print('User declined or has not accepted permission');
      }
      // print("### ${settings.authorizationStatus.toString()}");
    } else {
      // Request notification permission on Android
      PermissionStatus notificationStatus =
          await Permission.notification.request();
      if (notificationStatus.isDenied) {
        // Generating demo notification because to register notification channelID
        // to display notification as a heads up notificaiton
        LocalNotificationService.demoNotification();
      }
    }
  }

  static Future<void> getInitialMessage() async {
    initialMessage = await messaging.getInitialMessage();
  }

  static void setupAppOpenListener() {
    FirebaseMessaging.onMessageOpenedApp.listen(_handleMessage);
  }

  static void handleNotificationInForground() async {
    FirebaseMessaging.onMessage.listen((message) {
      if (message.notification != null) {
        requestNotificationPermission();
        LocalNotificationService.display(message);

      }
    });
  }


  static Future<void> setupInteractedMessage() async {
    // If the message also contains a data property with a "goToScreen"
    if (initialMessage != null) {
     
      if (initialMessage!.messageId != messageId) {
        messageId = initialMessage!.messageId;
      
        await _handleMessage(initialMessage!);
      }
      initialMessage = null;
    }

  
    FirebaseMessaging.onMessageOpenedApp.listen(_handleMessage);
  }

  static void handleBackgroundMessages() {
    FirebaseMessaging.onBackgroundMessage(_handleMessage);
  }

  // DESCRIPTION: Handeling remote message
  static Future<void> _handleMessage(RemoteMessage message) async {
        // This will handle rest of stuff
    }

 static void setupAppOpenListener() {
    FirebaseMessaging.onMessageOpenedApp.listen(_handleMessage);
  }

}

And here is the code I wrote in main.dart file

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  
  await FCMServices.getInitialMessage();
  FCMServices.setupAppOpenListener();

  //this is to setup device orientation of the app
  await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);

  runApp(const Root());
}

this is code from backend

public function sendNotificationToAllUsers($notificationData){

                    $title = $notificationData['title'];
                    $message = $notificationData['message'];
                    $type = $notificationData['type'];
                    $process_type = $notificationData['process_type'];
                    $process_date = $notificationData['process_date'];
                    $process_time = $notificationData['process_time'];
                    $user_id = $notificationData['user_id'];
                    $product_id = $notificationData['product_id'];
                    $images = $notificationData['images'];

                    $notification = ['body' => $message, 'title' => $title, 'image' => $images, 'sound' => 'default'];
                    $notification1 = ['body' => $message, 'title' => $title, 'image' => $images];
                    $data = ['screen' => 2, 'product_id' => $product_id];

                    $apns = [
                        'headers' => ['apns-priority' => '10'],
                        'payload' => [
                            'aps' => [
                                'content-available' => 1,
                                'sound' => 'default',
                                'alert' => $notification1
                            ]
                        ]
                    ];

                    $android = ['priority' => 'high', 'notification' => ['sound' => 'default']];
                     $fcmNotification = [
                                     'to' => '/topics/all',
                                     'notification' => $notification,
                                     'apns'=>$apns,
                                     'android'=>$android,
                                     'data'=>$data
                            ]; 
                    $ch = curl_init();
                    curl_setopt($ch, CURLOPT_URL, $this->fcmUrl);
                    curl_setopt($ch, CURLOPT_POST, true);
                    curl_setopt($ch, CURLOPT_HTTPHEADER, $this->headers);
                    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fcmNotification));
                    $result = curl_exec($ch);


            }

I am using

1. flutter version 3.13.0

2. dart version 3.1.0

3. firebase_messaging: ^14.7.10

4. firebase_core: ^2.24.2

5. Followed official firebase documentation

NOTE : I have code that subscribes to topic called “all” in my code which is not provided here, also I have all the required permissions to display notification on both android and IOS device