Canon EOS REBEL T7I Wi-Fi (Wireless Communication) Function Instruction Manual page 71

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.
Terminate the Wi-Fi connection.
5
Press the <k> button to display the

confirmation dialog. Select [OK], then
press <0> to terminate the Wi-Fi
connection.
Sending Images to the Other Camera
71