Notification sound too slow with default and customs sounds

[iSaqibShafique]

Describe the bug
I was using custom audios in Android and for iOS, Android is working good, but in iOS these are the problems.
1 - Notification sound too slow when notify.
2 - When using custom sound Notifications not working in iOS.

To Reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Sample code to reproduce the problem
static Future init() async {
const AndroidInitializationSettings initializationSettingsAndroid =
AndroidInitializationSettings('logo');
final DarwinInitializationSettings initializationSettingsDarwin =
DarwinInitializationSettings(
onDidReceiveLocalNotification: (id, title, body, payload) =>
Get.toNamed(AppRoutes.home, arguments: 3),
requestSoundPermission: true,
requestAlertPermission: true,
);
const LinuxInitializationSettings initializationSettingsLinux =
LinuxInitializationSettings(defaultActionName: 'Open notification');
final InitializationSettings initializationSettings =
InitializationSettings(
android: initializationSettingsAndroid,
iOS: initializationSettingsDarwin,
linux: initializationSettingsLinux,
);

await flutterLocalNotificationsPlugin.initialize(initializationSettings);

}

static Future showScheduleNotifications({
required DateTime notificationTime,
required String bodyText,
String? audio,
}) async {
try {
int notificationId = notificationTime.millisecondsSinceEpoch ~/ 1000;
AndroidNotificationDetails androidNotificationDetails =
AndroidNotificationDetails(
notificationId.toString(),
notificationId.toString(),
channelDescription: notificationId.toString(),
importance: Importance.max,
priority: Priority.high,
ticker: 'ticker',
sound: RawResourceAndroidNotificationSound(audio),
enableVibration: true,
);
NotificationDetails notificationDetails = NotificationDetails(
android: androidNotificationDetails,
iOS: const DarwinNotificationDetails(),
);

  if (notificationTime.isAfter(DateTime.now())) {
    await flutterLocalNotificationsPlugin.zonedSchedule(
      notificationId, // Use a distinct notification ID
      "Pink Elephants Coaching Company",
      bodyText,
      tz.TZDateTime.from(notificationTime, tz.local),
      notificationDetails,
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      // ignore: deprecated_member_use
      androidAllowWhileIdle: true,
      payload: "home",
    );
  }
} catch (e) {
  print(
      "Error scheduling notification: $e");
}

}

[iSaqibShafique]

Attention, also when I give custom sounds, it plays on earpiece not on speaker in iOS.