How to solve the problem of camera screen flashing

This situation is normal because of light reflection.

The solution is as follows:

1. First, find the camera software in your mobile phone and open it, as shown below.

2. Then on the camera page that opens, find the professional mode in the menu bar and click Enter, as shown below.

3. Then, on the professional mode page that opens, find and select the iso mode, as shown below.

4. Finally, in the opened page, adjust the degree, as shown below.