Solved Chrome Notification Sound Not Changing (ChromeOS)

Hey there! I just recently purchased Join, and I am loving it so far. I recently got a chromebook, and my main use case is forwarding my notifications from my android phone to my chromebook. I have set this up, and the forwarding is working perfectly, however, I can not figure out how to change the sound of the notification when it pops up on my chromebook.

I already changed it to what I want Join to use as the notification sound within the Android app settings, but the sound has not changed on my chromebook. I checked the extension settings but did not see a way to choose a custom sound there either, only to disable the sound entirely. Is there a way to accomplish this?

Thank you in advance, and thank you for an awesome app!

 

But there the sound can be switched on or off only but no change of the sound itself can be done, or do I overlook something?