Canon EOS REBEL T7I Wi-Fi (Wireless Communication) Function Instruction Manual page 36

Sending Images to a Smartphone from the Camera
Sending Multiple Selected Images
Select multiple images and send them at once.
If the multiple image selection screen is already displayed, start the
operation from step 3.
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Press <0>.
1
Select [Send selected].
2
Select the images to send.
3
Press the <Y> <Z> keys of the

cross keys to select an image to
send, then press <0>.

A checkmark [X] will be displayed on
the upper left of the screen.
By pressing the <I> button, you

can select images from a three-image
display. To return to the single-image
display, press the <u> button.
To select another image to send,

repeat step 3.
After selecting the images to send,

press the <Q> button.