Nikon Z 7 Reference Manual page 246

• Interval priority: Select On to ensure that frames shot in modes P
and A are taken at the chosen interval, Off to ensure that
photos are correctly exposed. If On is selected, check that the
minimum shutter speed chosen for ISO sensitivity settings >
Auto ISO sensitivity control in the photo shooting menu is
faster than the interval and that Release is chosen for Custom
Setting a1(AF-C priority selection) or Custom Setting a2 (AF-S
priority selection) according to the focus mode currently
selected.
222 Menu Guide > C The Photo Shooting Menu