How do I scan a document on the HP LaserJet Pro MFP M521?
Place the original document face-up in the document feeder or face-down on the upper left corner of the glass, then select a scan destination such as USB drive, Network Folder, or E-mail. Touch the Scan button to complete the scan. (Page 2)
From the official HP Laserjet Pro Mfp M521 Series manual, page 2
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