Canon EOS-1D X Mark III Advanced User's Manual page 724

Troubleshooting Guide
Troubleshoot camera issues by checking the camera and connected devices as described in
this section. If troubleshooting does not resolve the problem, contact a Canon Service
Center for product information and advice on product handling.
Cannot transfer images to an FTP server.
Set the Live View shooting/movie recording switch to <
to an FTP server after shooting.
Image transfer is not possible with the Live View shooting/movie shooting switch set to
< >.
Cannot perform linked shooting.
When performing linked shooting, set the Live View shooting/movie shooting switch to
< >.
Linked shooting is not possible with the Live View shooting/movie shooting switch set to
< >.
The camera heats up, and the transmission rate drops.
Continuous wireless operation over an extended period in high temperatures may cause
the camera's internal temperature to rise and slow down transfers. Error 83 may be
displayed if the camera becomes hotter, and wireless operation may stop (
> if you will transfer images
724
).