Canon EOS R3 Advanced User's Manual page 635

General Precautions on Camera Connect Communication
from Smartphones
Caution
If the Wi-Fi connection is terminated while recording a movie with remote shooting,
the following will occur.
• If the still photo shooting/movie recording switch is set to <
recording will continue.
• If the still photo shooting/movie recording switch is set to <
recording will stop.
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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