Canon EOS-1D X Mark III Advanced User's Manual page 623

Viewing Transferred Images
Images transferred to the FTP server are stored in the following folder as specified in the
FTP server settings.
Target folder of the FTP server
Under the default settings of the FTP server, images are stored in [C drive] → [Inetpub]
folder → [ftproot] folder, or in a subfolder of this folder.
If the root folder of the transfer destination has been changed in the FTP server settings,
ask the FTP server administrator where images are transferred.
623