Side note:
The page at https://dota-overlay.azurewebsites.net/live_config
Doesn’t fit in the area assigned for “Live Config” as it’s a really narrow column
For example
if it’s not showing in the drop down, try reloading the page, sounds like a caching hiccup and the dashboard doesn’t realise theres anything it should show yet.
In addition you did install and activate the extension into a panel/video overlay slot?