How do I enable and add a ringtone for an app I am creating?

[AC Question]

How to enable add ringtone for app I am creating

I am making a soundboard app and was wondering what I need to do to allow people who install it to be able to add the sounds as ringtones and notifications?

Is this only done while uploading app to Google Play Store, or do I need to do something when I create the app to allow users to install as ringtones and notifications?