Epson WorkForce AL-MX300DN - Manual (Page 40)

4. Insert the MP tray into the printer.
Note:
After loading paper, set the MP Tray Size and MP Tray Type settings to match the loaded paper
size and type on the control panel. For details, see “Tray Menu” on page 141.
Paper cassette
This cassette gives you a second paper source in addition to the MP tray.
Note:
Perform the same procedure to load paper into the optional paper cassette.
AL-MX300 Series User's Guide
Paper Handling 40