Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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W-38
You can specify images viewable from a smartphone by operating the 
camera. Images can be specified during connection setup or after 
the connection is terminated.
1
Select [Communication settings].
Under the [54] tab, select 
[Communication settings], then 
press <0>.
2
Select [Built-in wireless settings].
3
Select [Wi-Fi function].
Set [Wi-Fi/NFC] to [Enable], then 
select [Wi-Fi function] (p.W-12).
Specifying Viewable Images