Question about the custom notifications plugin by DevilBro

So I recently discovered better discord, and I mainly have been wanting to change the notification sounds like incoming calls and messages. I followed the steps to do just that, and uploaded an audio file for the incoming call. I had a friend of mine test it by calling me, but instead of my sound, I had both my sound and the original discord sound play at the same time. I have checked things like streamer mode to make sure its off, but I just cannot find out how to make it so its only my audio file playing. Can anyone help?