Go to the settings of your phone and turn on this permission. This is because it is forbidden to take pictures on mobile phones. After opening, WeChat can use the camera normally. Let me take an Android phone (Glory 9x) as an example to illustrate the operation steps:

1. Find the settings on the mobile phone desktop, and click inside to find the applications and services;

2. Click Application Management;

3. Find WeChat and search for WeChat directly at the top;

4. Click permissions;

5. Click on the camera;

6. Adjust the camera function to allow only during use, as shown below.

In this way, when you open WeChat, you want to use the scanning function, or you can turn on the camera normally when taking photos/videos or making video calls.