To change the Snapchat notification sound on an Android device, follow these steps based on the provided sources:

  1. Open the Settings app on your Android device.
  2. Navigate to Apps or App Manager.
  3. Locate and tap on Snapchat.
  4. Choose Notifications, then tap Sound.
  5. From the list of available sounds, select the one you want to use for your Snapchat notifications.
  6. Confirm your selection by tapping OK.

For iOS users who don't have Snapchat+ subscription (which allows for customizing notification sounds within the app), you can change the general notification sound for all apps including Snapchat:

  1. Open the Settings app on your iPhone or iPad.
  2. Tap Sounds & Haptics.
  3. Tap Text Tone.
  4. Choose a new sound from the list underneath the Alert Tones section.
  5. Exit the Settings app; the selected sound will now be applied to your Snapchat notifications.

Please note that on iOS, this method changes the notification sound for all apps, not specifically for Snapchat. If you have Snapchat+, refer to the instructions in the WikiHow article mentioned earlier for customization within the Snapchat app.