The maximum transfer size limits the user to a specified number of upload or download kilobytes per session. FTP does not send information to the Server regarding the number of bytes that a user sends.
A user can start a transfer of virtually any size; however, once the limit is reached, the Server will not transfer the rest of the file.
To set the maximum upload size
In the Administrator, connect to the server, then click the Server tab.
In the left pane, click the user or User Setting Level you want to configure.
In the right pane, click the Quota tab.
Select the Max Upload/Download Size check box and specify the maximum amount of data (in kilobytes) the user may transfer during a session.