[How To] Add texture paper background on Fresco

I read this in an article from adobe fresco 

"Easier-to-use equipment.
Transitioning to digital tools means that you don't require as much equipment. To assemble a traditional watercolor painting set, you need different brushes, paints, palettes, and the necessary studio space and equipment to get to work. But with a digital tablet, Adobe Fresco, and a digital pen or stylus, you have all the equipment you need. Additionally, the use of different background textures and canvases (like watercolor paper) can be accessed in the app or downloaded as free texture packs to help you create imagery with its own unique character."

so how do I add watercolor paper texture in the app? Or as a free texture pack? Where would I find free texture packs that I can download for fresco? 
thanks to anyone who has some answers! 

[Renamed by Mod]