Canon EOS 5D Mark IV Instruction Manual page 95

If [Viewable imgs] is set to any setting other than [All images], remote
shooting is not possible.
When reconnecting to a smartphone, check the settings of viewable images
before establishing a connection.
Select [q].
4
If the [qWi-Fi on] screen appears,

select [Disconnect,exit].
Select [Review/change settings].
5
Select [Viewable imgs].
6
Specifying Viewable Images
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