How do I handle paper trays safely on the HP LaserJet Managed MFP E52645?

Do not extend more than one paper tray at a time, and do not use a paper tray as a step. Keep hands out of paper trays when closing, and ensure all trays are closed when moving the printer. (Page 4)

From the official HP Laserjet Managed Mfp E52645 manual, page 4

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