Mi band 8 does not display Yan characters.

You mean what if mi band 8 doesn't display facial characters? The method is as follows:

1. Open the Xiaomi Sports APP on your mobile phone, go to Personal Center-Bracelet-Bracelet Settings-Emoji Management, and open the "Emoji" button.

2. In "Add Expression File" under "Expression" option, you can select the expression file to be added, and the file format is gif.

3. After adding, re-enter the Personal Center-Bracelet-Bracelet Settings-Expression Management, find the added expression file and set it as "Display".

4. When the bracelet receives a new message, it will automatically display the added expression.