Creating Frames

Does anyone have any links to a good explanation of how to create custom Frames for WonderDraft?

Or, is anyone able to provide some advice?

I'm comfortable creating the graphics, but actually turning them into an asset seems less straightforward than other types of assets. I'm clearly missing something.

I believe it uses a method/technique called 9-path image. The best option is to look up some info on that and download some already existing ones.

Thanks. That helped. Between looking at that and interrogating the txt file associated with another custom one I figured it out.