FCM custom sound not working on iOS when in background mode

Question

Did something change with FCM recently? Our apps use custom sound in push notifications. This has been working fine on both Android and iOS, whether in foreground, background, or closed. But recently something seems to have changed as the same PHP code we've been using suddenly stopped working for custom sounds when the app is closed or in background mode? (The notification is delivered, but it just uses the default device sound).

I was able to get it working again on Android by just including the sound files in /app/src/res/raw (we used to keep them there, but for a long time now it wasn't needed yet always worked... apparently it's needed again). Ok Android solved.

But for iOS it still has stopped working! I'm not sure if it's something I'm doing wrong in xCode or if I need to change the PHP code used to trigger the notifications. So here's both to review:

I am using:

• xCode 11.6
• iOS target 11.0
• Testing on real device, iOS 13.6.1
• Sound files are at {Project Name}/Resources/ and were added with "Copy items if needed" and "Create groups" both checked

Server side code to trigger notifications (which always worked fine before and has not been changed):

{
  "notification": {
      "title": "Test Title",
      "body": "Test Body",
      "sound": "sound_file.mp3",
  },
  "registration_ids": ["APA...g","fl...CS"]
}

Please help... thought I was past all of this years ago...ugggg!

Answer 1

Detail information:

https://medium.com/@ThatJenPerson/authenticating-firebase-cloud-messaging-http-v1-api-requests-e9af3e0827b8

Sample code:

{
"message":{
  "token":"ewrTK.....",
  "notification":{
     "title":"Breaking News",
     "body":"New news story available."
  },
  "data":{
     "title":"Notification title",
     "body":"Notfication body"
  },
  "apns":{
     "payload":{
        "aps":{
           "sound":"notification.mp3"
        }
     }
  }
}
}