You may find that the notification sound is not working in Snapchat. This is because you need to enable it. To enable notification sounds in Snapchat:
- Open Snapchat
- Go to the camera screen
- Tap on the cube at the bottom left
- Select the settings option (looks like a cog at the top right)
- Under My Account, set Notification Sound to by On
Notification sounds in Snapchat should now be working.