Hi!
I am using the FirebasePushNotification Plugin in it's version 2.3.6. I have configured the plugin like described and have generated a JSON-Payload (data and notification) that I am sending from my server to the FCM Service. In this JSON I have listed the filename of the my custom sound ('customsound.wav') that should be played when notification reaches a device.
NOW my problem is: Push Notification messages come in but my custom sound is not being played. Only the default sound will be played.