I am using the Awesome Notifications package in Flutter to handle notifications across both Android and iOS. While I can successfully implement custom notification sounds on Android, I am facing issues with iOS where no sound is played when a notification is received. If I remove the soundSource parameter, the default notification sound plays without any issues.

Here’s the NotificationChannel configuration I am using:

NotificationChannel(
  channelKey: notif.notificationIdIlacZamani_key(),
  channelName: notif.notificationIdIlacZamani_kanal_adi(),
  channelDescription: notif.notificationIdIlacZamani_kanal_aciklama(),
  playSound: true,
  //soundSource: 'resource://raw/tunnel', //for android 
  soundSource: 'tunnel.caf', //for ios
  onlyAlertOnce: true,
  groupAlertBehavior: GroupAlertBehavior.Children,
  importance: NotificationImportance.Max,
  defaultPrivacy: NotificationPrivacy.Public,
  defaultColor: Colors.deepPurple,
  ledColor: Colors.deepPurple,
)

I have placed the tunnel.caf file in the ios/Runner/Resources folder of my project. If I remove the soundSource parameter, the default notification sound plays on iOS.
I’ve already tried the following:

• Ensuring the sound file format is compatible with iOS (.caf in this
  case)
• Checking the file path and name for any errors
• Testing on a real iOS device, not just the simulator
• Added tunnel.caf to the iOS project in Xcode under Runner/Resources and Runner/Assets and Runner/

However, the custom sound still doesn’t play. What am I missing or doing wrong? How can I get custom notification sounds working on iOS?