Nikon Z 9 Reference Manual page 557

Option
[Frame size/
frame rate]
[Interval
priority]
[Focus before
each shot]
[Destination]
Choose the frame size and rate for the final video. The
options available vary with the setting chosen for [Video
file type].
•
[ON]: Enable interval priority to ensure that frames shot
in modes P and A are taken at the chosen interval.
- Release priority is enabled regardless of the options
selected for Custom Settings a1 [AF-C priority
selection] and a2 [AF-S priority selection].
- If [ON] is selected for [ISO sensitivity settings] >
[Auto ISO sensitivity control] and the time chosen
for [Minimum shutter speed] is longer than the
interval, the time selected for the interval will take
priority over the selected shutter speed.
•
[OFF]: Disable interval priority to ensure that photos
are correctly exposed.
If [ON] is selected, the camera will focus between shots.
Choose the slot used to record time-lapse videos when
two memory cards are inserted.
Description
C The Photo Shooting Menu: Shooting Options
557