Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 632)

4.
Select [Sel.Image].
5.
Select an image to transfer.
Use the < > dial to select an image to transfer, then press < >.
Use the < > dial to add a [ ] in the upper left of the screen, then
press < >.
For three-image display, press the < > button and turn the < >
dial left. To return to single-image display, turn the < > dial right.
To select other images to transfer, repeat step 5.
After image selection, press the <
> button.
6.
Select [Transfer].
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