1. First, turn on Xiaomi 8 mobile phone. We found the photo album software on the mobile phone desktop. Click the software to enter the main interface of the photo album.

2. After entering the album page, we can see a three-point button in the upper right corner of the page. Click this button to enter the next step.

3. Then a window will appear in the upper right corner of the interface. We can find the option of "free space" in the window, just click this option.

4. Next, we will enter the interface shown below. We will find the slimming button on the interface and click it.

5. Then a window will appear at the bottom of the interface. We can find a good button in the window and click this button to enter the photo selection page.

6. Finally, select the image to be compressed on the page, and then click the Start Slimming button at the bottom of the interface, and the image compression is successful. The above is how Xiaomi Ba mobile phone compresses a lot of pictures.