Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 507)

Caution
With a Wi-Fi connection to a smartphone established, certain functions are
unavailable.
In remote shooting, the AF speed may become slower.
Depending on the communication status, image display or shutter release timing
may be delayed.
When saving images to a smartphone, you cannot take a picture even if you press
the camera's shutter button. Also, the camera screen may turn off.
Note
With a Wi-Fi connection established, disabling the smartphone's power saving
function is recommended.
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