How do I add paper to the tray?
Open the front cover, lift out existing paper if necessary, and load new paper into Tray 1. The maximum media size is 216 x 356 mm for plain paper (60-120 g/m²), photo papers (125-300 g/m²), envelopes (75-90 g/m²), and specialty papers.
From the official HP Pagewide Pro 477dw Multifunction Printer manual, page 3
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