Nikon Z 8 Reference Manual page 278

5
Save the overlay.
Highlight [Yes] in the confirmation dialog and press J to save
the overlay.
D
Cautions: "Motion Blend"
The final picture may differ from the preview both in how it looks (including color and brightness)
and in how the pictures are combined.
Only pictures created with this camera can be selected. Pictures created with other models cannot
be selected.
[Motion blend] is intended for bursts shot with the camera on a tripod, with a fixed background
and moving subjects. The desired results may consequently not be achieved with bursts shot
without a tripod.
The overlay will include only pictures created with the same options selected for [Image area] >
[Choose image area] in the photo shooting menu.
The image quality setting for the completed overlay is that of the highest quality picture it contains.
Overlays that include NEF (RAW) pictures will be saved at an image quality of [JPEG/HEIF finem].
All JPEG pictures in the overlay must be the same size.
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Motion Blend