notifications - How to define a custom sound for Whatsapp? - Android Enthusiasts Stack Exchange
How to Change Ringtone in Messenger [2022] - SociallyPro
How to Change the Notification Sound on Facebook Messenger on Android
Sending a link to a .mp3 file over Snapchat will automatically play it on the receivers phone before they open the message even if the screen is off. : r/softwaregore