Canon EOS-1D X Mark III Advanced User's Manual page 616

In a folder
• Selecting [Folder images failed transf.] selects all images in the
selected folder for which transfer failed.
• Selecting [Folder images not transfer'd] selects all unsent
images in the selected folder.
• Selecting [Clear folder transf. history] clears the transfer history
of images in the selected folder. After clearing the transfer history,
you can select [Folder images not transfer'd] and transfer all
images in the folder again.
In a card
• Selecting [Card images failed transfer] selects all images in the
selected card for which transfer failed.
• Selecting [Card images not transferred] selects all unsent images
in the selected card.
• Selecting [Clear card's transf. history] clears the transfer history
of images in the selected card. After clearing the transfer history,
you can select [Card images not transferred] and transfer all
images in the card again.
4.
Select [FTP transfer].
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