Setting up custom notification sounds using OneSignal.
To setup:-
<ol>
<li>Login into your OneSignal Dashboard </li>
<li>Go to Settings and Message Section <img src="https://firebasestorage.googleapis.com/v0/b/web-to-native-website.appspot.com/o/tinymce%2FScreenshot%202023-03-10%20at%206.12.22%20PM.png?alt=media&amp;token=e28f967a-0f1c-4ae9-9fd7-154bef43150d" alt="" width="1024" height="530" /> </li>
<li>Scroll to the bottom section - Android Notification Channels. If there is an existing channel and you want to use that then you can use it or create a new one. <img src="https://firebasestorage.googleapis.com/v0/b/web-to-native-website.appspot.com/o/tinymce%2FScreenshot%202023-03-10%20at%206.12.36%20PM.png?alt=media&amp;token=fedbc21e-3327-4dc6-9ac2-386e9c3e3591" alt="" width="1024" height="530" /> </li>
<li>You'll get the Channel id here store it. <img src="https://firebasestorage.googleapis.com/v0/b/web-to-native-website.appspot.com/o/tinymce%2FScreenshot%202023-03-10%20at%206.12.53%20PM.png?alt=media&amp;token=2f808cc7-5bb0-4d29-9aa7-cc1c6dc6ee14" alt="" width="1024" height="530" /> </li>
<li>Change the settings as you like but don't forget to change the sound setting as Custom and add the value "tone". <img src="https://firebasestorage.googleapis.com/v0/b/web-to-native-website.appspot.com/o/tinymce%2FScreenshot%202023-03-10%20at%206.13.02%20PM.png?alt=media&amp;token=c84fc833-f6c6-4242-b15b-573ae16c0f3b" alt="" width="1024" height="530" /></li>
</ol>
 Prerequisites - You should have "Custom Sound for Notification" as an AddOn and added the sound you wanted added in the app build.

Notification Custom Sound using OneSignal