When [Use Paper Tray Settg] is selected, the machine scans the originals based on the size and orientation of the paper loaded in the selected tray. With this method, you do not have to specify the size and orientation of the originals.
Select the paper tray containing the paper that is the same size and orientation as the originals.
Press [Original Settng].
Press [Original Size].
Press [Use Paper Tray Settg].
Press [OK] twice.