Nikon D810 - Manual (Page 283)

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3
Click
Start Transfer.
At default settings, pictures on the memory card will be
copied to the computer.
4
Terminate the connection.
When transfer is complete, turn the camera off and
disconnect the USB cable.
A
Windows 8.1
Windows 8.1 may display an AutoPlay
prompt when the camera is connected.
Tap or click the dialog and then tap or
click Import File/Nikon Transfer 2 to
select Nikon Transfer 2.
Start Transfer