Nikon D810 - Manual (Page 97)

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4
Save the copy.
Highlight Yes and press J to create a
fine-quality (0 79) JPEG copy of the
selected frame.
A Save Selected Frame
JPEG movie stills created with the Save selected frame option can not
be retouched. JPEG movie stills lack some categories of photo
information (0 238).
A
The Retouch Menu
Movies can also be edited using the Edit movie option in the retouch
menu (0 384).