Can someone explain the difference between the classic bot option and copilot option when creating a new copilot? I don't understand the adding of the skills. Can the classic bot call a copilot? Do you give the classic bot the manifest json of the copilot? Or the other way around? Where do you get a manifest json for the copilot? I've downloaded the manifest.jason of the copilot but the classic bot won't take the manifest URL from the json. I am so lost on how your supposed to make this work. Any insight on how the two talk to each other would be super helpful.