Sending files can be divided into online sending and offline sending: 1 Online sending requires the consent of the recipient before the file is sent.

If it is sent offline, the system will send the file to the transfer station first, and then prompt the recipient to receive the file. At this time, the recipient can choose to receive the file or refuse to receive it. After the recipient makes a choice, the sender will also receive feedback from the system.

Off-line transmission can be received