as per the machine specification it support paper up to 12.6' x 19' from the bypass Tray
If you facing this issue while you are copying then load the 12'X19" paper in the bypass tray and set the paper size to custom size and enter the measurment for the width and the height 12" x 19" if the machine default measurment unit in inch or it will be 304.8 x 482.6 mm if the machine default measurment unit in mm
then go to copy icon on the machine UI and touch the paper supply and select the bypass tray then go reduce/enlarge option and set it to 100% .
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Was call over because the Xerox was not copying. The page measures 9"x12" and the setting was for 8 1/2" x 11". They solved their immediate problem by cutting the 70 sheets down to 8.5"x11". Can the Xerox C8055 be set to use 9"x12" paper?