I cannot make sense of Echo integration. I have multiple Things on ST (lamps, smoke detectors, etc). I added SmartThings Skill in Alexa and signed into Samsung ST account with username and password.
In Alexa app > Smart Home Skills >SmartThings/Samsung Connect is enabled and linked. When I tap Discover, Alexa app takes 20 seconds and found one item. - Z-Wave Relay. I guess that is an plug-in outlet I have on landscape lighting
No other devices are found.
Furthermore, in ST App>Automation>SmartApps I cannot find an Alexa smart app (which seems to be required in my reading of the forums?