Running environment: Glory MagIcBook, WIndows 1 1, the latest version of Google browser, etc.
1. Log in to official website and QQ mailbox, and click Write on the home page.
2. Enter the email address of the recipient.
3. Add a subject and body to the email.
4. Then click Add Attachment or Extra Large Attachment (ordinary attachments only support files below 50MB, and extra large attachments support files below 3GB).
5. After editing, click Send in the lower left corner and send it to the recipient's mailbox.