: Open Settings > Sounds and vibration > Notification sound .
iPhone requires a few extra steps because it uses the .m4r format for tones: Download notification 125767 mp3
: To set a sound for just one app (like TikTok or WhatsApp), go to Settings > Notifications > App notifications , select the app, and tap Notification categories to change the sound for specific alerts. Setting Custom MP3 Notifications on iPhone : Open Settings > Sounds and vibration > Notification sound
