Canon EOS 5D Mark IV Instruction Manual page 22

Basic Operation and Settings
When multiple exposures or time-lapse movie is set, you cannot select

[54: Communication settings].
Interface Cable Connection Cautions
During a wireless LAN connection, you cannot use the camera by

connecting it to Connect Station, a computer, a wireless file transmitter,
or another device with a cable. Terminate the connection before
connecting a cable.
When the camera is connected to Connect Station, a computer, a

wireless file transmitter, or another device with a cable, you cannot select
[Built-in wireless settings]. Disconnect the cable before changing any
settings.
Cards
For [l] and [w], the camera cannot be connected wirelessly if a card

with images recorded is not inserted into the camera.
Using the Camera with a Wireless Connection Established
When you want to prioritize the wireless connection, do not operate the

power switch, card slot cover, battery compartment cover, or other parts.
Otherwise, the wireless connection may be terminated.
Using an Eye-Fi Card
When [Wi-Fi/NFC] is set to [Enable], image transfer using an Eye-Fi

card is disabled.
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