Canon EOS R50 Advanced User's Manual page 577

(3) Sending a specified range of images
1.
Press the <
2.
Select [Send range].
3.
Specify the range of images.
> button.
Select the first image (start point).
Next, select the last image (end point). A checkmark [ ] will be
appended to all the images within the range between first and last
images.
To clear the selection, repeat step 3.
To change the number of images shown in index display, press the
< > or < > button.
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