How do I perform a manual duplex copy?

Start the copy job on either the LCD or touchscreen control panel, then retrieve the single-sided page from the output bin and place it with the printed-side facing down, top edge first in the input tray. Repeat this process until all pages are copied.

From the official HP Color Laserjet Pro Mfp 3301 3304 3388 Printer manual, page 35

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