How to set up offline file SMS notification using China Mobile Fetion?

The SMS notification of offline files is not set by the recipient. It is the sender who sets the offline SMS notification.

That bitch just sent you an offline file. After the transmission is successful, a prompt will appear. Click whether to send SMS notification. If the sender clicks here to send SMS notification, you can receive SMS notification of offline files normally. If the sender's behavior is such a short message notification, then you won't receive it. However, recipients cannot set SMS notifications for offline files.