I’d suggest providing a bit more information, e.g. what does your app do?
My guess is based off the category of app you’ve chosen, you need to use a theme app extension.
This one is just a “age checker pop-up” very simple app..
So yeah, you will most likely need to use a theme app extension for that.
I had to remove the “theme app extension” its submitted now. Thank you for looking into this.
Cheers,
Cephas