How to send a prerecorded audio clip on Facebook as a message (Samsung Galaxy S4, Android 5.0.1) - Quora
How To Send Audio Song / Mp3 File on Facebook Messenger - YouTube
How to Change the Notification Sound on Facebook Messenger on Android
How to Turn Off Sent Message Sound on WhatsApp for iPhone
Facebook Messenger app changing notification settings by itself - OnePlus Community
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
notifications - How to define a custom sound for Whatsapp? - Android Enthusiasts Stack Exchange