Canon EOS-1D X Mark III Advanced User's Manual page 657

7.
Take the picture.
Select (4) Shutter button, and when you release the button, the camera
shoots.
Captured images are saved to the card in the camera.
To browse and download images, see
Caution
Depending on the communication status, image display or shutter release timing
may be delayed.
Still photo shooting is not possible with the camera's Live View shooting/movie
shooting switch set to < >.
657
Browsing Images.