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Check in An App from On Premise
Set the destination(Sever/Stream details where you need to Publish) as per your needs.
Open the App And Go to Connections tab for the Environment where u need to Publish (to define a mapping connection, you need to log in a cloud environment)
Click on Select Env Connection and select the connection from where u expect data to be fetched and click on Save.
Click on Save.
Go Back and publish the App
Reaload status = In progress
Once Done, status should be Instant Reloaded or Reloaded.
Go to Cloud the specified stream and check the connection is updated.
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