You need to log in to WeChat on your computer and mobile phone at the same time.

1. After logging in to WeChat, enter "File Transfer Assistant" in the search bar at the top of the computer WeChat interface.

2. Open the chat interface of the file transfer assistant and click "Send File" in the editing window.

3. Find the video you want to send in the pop-up window, click "Open", and then click "Send" in the chat interface, so that the video will be exported to WeChat.