Nikon Z 8 Reference Manual page 273

4
Save the overlay.
Press J to save the overlay.
D
Cautions: "Overlay (Add)"
Colors and brightness in the preview may differ from the final picture.
Only pictures created with this camera can be selected. Pictures created with other models cannot
be selected.
The overlay will be the same size as the smallest of the two component pictures.
The overlay has the same photo info (including date of recording, metering, shutter speed, aperture,
shooting mode, exposure compensation, focal length, and picture orientation) and values for white
balance and Picture Control as the first of the two pictures selected. Copyright information, however,
is not copied to the new picture. The comment is similarly not copied; instead, the comment
currently active on the camera, if any, is appended.
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Overlay (Add)