You can send an urgent document ahead of the other faxes waiting to be sent.
You cannot send your document preferentially while one of the following is in progress because the printer cannot accept another fax.
Sending a monochrome fax with Direct Send enabled
Sending a color fax
Sending a fax using a connected telephone
Sending a fax sent from the computer (except when sending from memory)
You can find the menu on the printer's control panel below.
Fax > Fax SettingsPriority Send.