Canon EOS REBEL T7I Wi-Fi (Wireless Communication) Function Instruction Manual page 40

Sending Images to a Smartphone from the Camera
Sending All Images on the Card
Send all images on the card at once.
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Press <0>.
1
Select [Send all card].
2
Select [Resize image].
3
Set it as necessary.

On the displayed screen, select an

image size, then press <0>.
Select [Send].
4
 The images will be sent. When the
transfer is complete, the screen for
step 1 will reappear.