Canon EOS R3 Advanced User's Manual page 545

3.
Select the folder.
(1) Number of images in folder
(2) Lowest file number
(3) Folder name
(4) Highest file number
Select the source folder, then press <
When selecting the folder, refer to the images displayed at right of the
screen.
4.
Select an image to copy.
(1) Total images selected
Turn the <
To select another image to copy, repeat step 4.
> dial to select an image to copy, then press <
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>.
>.