Canon EOS-1D X Mark III Advanced User's Manual page 221

Checking and Deleting Multiple Exposures During
Shooting
To view the multiple-exposure image so far, check exposure, and see how the images are
layered, you can press the <
of exposures (when [On:Func/Ctrl] is set, but not with [On:ContShtng]).
Pressing the < > button will display the operations possible during multiple-exposure
shooting.
Operation
Return to previous
screen
Undo last image
Save and exit
Exit without saving
Caution
During multiple-exposure shooting, you can only play back multiple-exposure
images.
> button before you finish shooting your specified number
The screen before you pressed the <
Deletes the last image you shot (enabling you to replace it by shooting again).
The number of remaining exposures will increase by 1.
With [Save source imgs: All images], saves all single exposures and the
multiple-exposure image created so far and exits multiple-exposure shooting.
With [Save source imgs: Result only], saves only the multiple-exposure
image created so far and exits multiple-exposure shooting.
Exits the multiple-exposure shooting without saving the image.
Description
> button will reappear.
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