How to set the flash when Apple's mobile phone receives information?

Apple's mobile phone received a message and wanted to set the flash reminder effect. The operation steps are as follows:

Tools/materials: Apple 13promax, iOS 15, system settings 1.0.

1. Click Accessibility in the phone settings menu.

2. On the Accessibility page, click Audio/Video.

3. Set the switch behind the flashing LED as a reminder.