Channel Type Step
The Channel type step compares the current run's channel type with a selected list. It is available only in For dialogs automations.
Select Channel Types
Open the step on the workflow. In Channel types, select one or more options.
Yes applies when the current channel type belongs to the selected list. No applies to every other type and when the run has no available channel. An empty list cannot be saved.

This field checks the integration type, such as Telegram or VKontakte, rather than a particular connected channel. To limit a trigger to particular connections, use Channels in Incoming message.
Connect Both Branches
Connect Yes and No. If one branch is left unconnected, the editor shows a warning and a run that chooses it ends at this step. Each branch can then use settings suited to its channel types, such as different message text or buttons.