Nikon D810 - Manual (Page 406)

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This option is displayed only when an Eye-Fi memory card
(available separately from third-party suppliers) is inserted in the
camera. Choose Enable to upload photographs to a preselected
destination. Note that pictures will not be uploaded if signal
strength is insufficient.
Observe all local laws concerning wireless devices and choose
Disable where wireless devices are prohibited.
Eye-Fi Upload
G
button ➜ B setup menu
D
Eye-Fi Cards
Eye-Fi cards may emit wireless signals when Disable is selected. If a
warning is displayed in the monitor (0 470), turn the camera off and
remove the card.
Set Custom Setting c2 (Standby timer, 0 319) to 30 s or more when
using an Eye-Fi card.
See the manual provided with the Eye-Fi card, and direct any inquiries
to the manufacturer. The camera can be used to turn Eye-Fi cards on
and off, but may not support other Eye-Fi functions.