1. Insert the USB flash drive into the USB interface of the computer host to confirm that the computer can find the USB flash drive.
2. Download the MP4 square dance you need from the Internet to the Internet cafe computer, and remember the path to download the file.
3. Find the MP4 video file you downloaded, right-click and select Copy.
4. Open the USB flash drive, right-click the blank space of the USB flash drive and select Paste. After copying the file, you can safely exit the USB flash drive.