Dell C2665dnf User Manual page 36

Scanning to a USB Memory (Scan to USB)
With the Scan to USB feature, you don't need a PC to
connect a USB memory. You can specify the USB memory
inserted into the printer's port as a data saving location
when you scan data.
Making Copies From the DADF (Scan From DADF)
You can scan pieces of unbound paper using the duplex
automatic document feeder (DADF). When you scan
documents using the DADF, load them facing up.
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Product Features
Making Copies From the Document Glass (Scan From
Document Glass)
You can scan the pages of a book or a brochure from the
document glass. When you scan documents using the
document glass, place them facing down.