set custom Sound from only my application in push notification android

Question

I need to set custom sound for only my application. I've assigned a custom ringtone from my storage to be used in notifications.

What did I try...

(NotificationChannel) channel.setSound(Uri.parse("MY_PATH"), audio_atrr);

(NotificationCompact.Builder) mBuilder.setSound(Uri.parse("MY_PATH"));

(Notification) mNotification.sound = Uri.parse("MY_PATH");

It's useless for me, my device always plays the default sound when a notification is coming. what can i do?