PLease help how to use android native plugins to create games services and plugins

My concern is, I am not getting understand that I have create UI manually for both game services and native plugins or it will generate online. Just we have to configure it in android native settings?

Remember I have publish game services before on google play console and Import android native plugin, after publish now ,but I have only configure android native settings in that, nothing else. Will it work when I upload another apk file on console or need to add something else. I am also unable to understand from android native plugin documentation. Please help me, i am confusing…

It will be very thankful!

Anybody, please help on this