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

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Specifying Viewable Images
4
Select [q].
If the [qWi-Fi on] screen appears, 
select [Disconnect,exit].
5
Select [Review/change settings].
6
Select [Viewable imgs].
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.