Canon EOS-1D X Mark II G Instruction Manual page 26

Configuring FTP Server Connection Settings
Select [Delete root certificate] on the screen for step 6 to delete the

root certificate imported to the camera. Select [View root certificate
details] to check the issuer, subject, validity period, and other
information.
You can import a certificate from the card selected for [Record/play] or
[Playback] under [51: Record func+card/folder sel.].
26
Select [Set root certif].
5
Select [Load root certif from
6
card].
Select [OK].
7
The root certificate is imported.

Select [OK] on the confirmation

dialog to return to the [Set root certif]
screen.