How to turn off the sound when collecting red envelopes?

(Take the iPhone series as an example) Just collect the red envelope, enter the phone settings-select APP- and set the closing sound in the notification sound. The specific operation steps are as follows:

1, open the phone and click Settings.

2. Then enter the setting center.

3. Click the application without voice notification.

4. Then enter the app Settings page.

5. Then click Notify.

6. Then enter the notification settings page.

7, and then find the sound off button.

8. Finally, the sound was successfully turned off.