What does it mean that the QQ mailbox transfer station is full? How to solve it?

Enter QQ mailbox first, and find the file transfer station in the mailbox. After clicking, the contents of your transfer station will be displayed. You can delete unnecessary content, or download the contents of the transfer station to your computer for storage.

The transfer station of QQ mailbox can actually be regarded as a temporary hard disk for temporarily storing files. Of course, if the email attachment is too large, it will also be stored in the transfer station.