How do I insert envelopes for printing?
To print envelopes: Use Tray 1 to insert up to 10 envelops face-up with short, postage end leading into the printer. Set paper type in Windows to 'Envelopes' and then manually adjust tray orientation based on envelope's dimensions before sending jobs. Information about this process can be found on page 29.
From the official HP Laserjet Pro Mfp M428 M429 manual, page 28
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