Canon EOS 77D Wi-Fi (Wireless Communication) Function Instruction Manual page 37

Sending Images to a Smartphone from the Camera
Select [Resize image].
4
Set it as necessary.

On the displayed screen, select an

image size, then press <0>.
Select [Send].
5
 The images will be sent. When the
transfer is complete, the screen for
step 1 will reappear.
To send other images, repeat steps 1

to 5.
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