Help with ctx object and slugs?

Help with the CTX object and SLUGS! First: slugs in the Plasmic studio are defined with in the form [XXX] but in the React Router documentation, they are defined as :XXX. Whichever way, I cannot get the Plasmic sync’ed components to see the slug. Even after appending a * to the path in the App.tsx file. When I try to debug the value of $ctx.params to the console, I get “undefined”. Is there a special way to make sync’ed components SEE the slug the URL? Thanks