The retry cover sheet is used in very specific situations. For example, assume that you send a multi-page fax to a FAX machine and for some reason the FAX machine is taken off line or shuts down in the middle of the process of receiving the fax. Faximum will try to send the untransmitted portion of the fax again. If it succeeds it will transmit the retry cover sheet and then transmit the remaining pages of the fax.
You specify the name of the retry cover sheet in the Style that defines the cover sheet.