Canon EOS REBEL T8i Advanced User's Manual page 577

Sending a specified range of images
Specify the range of images to send all the images in the range at once.
1.
Press <
2.
Select [Send range].
3.
Specify the range of images.
>.
Select the first image (start point).
Select the last image (end point).
Images will be selected and [ ] will appear.
To cancel the selection, repeat this step.
You can press the <
shown in the index display.
> button to change the number of images
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