Canon EOS-1D X Mark III Advanced User's Manual page 595

Configuring Communication Function Settings
The following instructions are for settings that vary depending on the communication
function. Refer to the page that introduces your selected communication function.
1.
Select [New settings].
Select [OK] to go to the next screen.
By selecting [Select from list] when communication function settings
are already registered on the camera, you can apply the registered
settings.
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