Hi All
I have some customer sound file named as .x-wav / .x-m4a, when specify sound file with extension .x-wav, like content.sound = [UNNotificationSound criticalSoundNamed:@"mysound.x-wav" withAudioVolume: 1.0];
it will play defaultcrititicalsound.
if I tried
content.sound = [UNNotificationSound criticalSoundNamed:@"mysound.wav" withAudioVolume: 1.0];
then it worked