Nikon Z 6II Reference Manual page 680

5
C / f : Compose the shot and arrange the flash
units.
•
See the documentation provided with the flash units for
more information.
•
Test-fire the units and confirm that they are functioning
normally. To test-fire the units, press the i button in the
flash info display, highlight [ c Test flash], and press J
( 0 659).
6
C : Take the photograph.
Radio AWL
638