Or it can be like this:
1, find an online watch and buffer it well.
2. Select the internet option from the browser's tools menu.
3. Select "Settings" under "Browsing History"
4. Select "View Files" and you will be in the folder of all the buffered files.
5. Right-click Arrange Icons and Chronologically.
6. It's easy to find the video file, copy it to another folder, and you can watch it later.