Depth for objects in a 2D environment?

Hello!
So, I’ve worked before on 3D environments and I’ve created there a flipbook. It’s based on a 3D Object, a Quad. That’s the quad I normally use to create the book cover and the pages and all that.
However, now that I have to work on a 2D environment I tried to follow the same procedure but came to know I can’t do so because the 3D objects orbasically everything on this 2D environment won’t have a depth.

What I can I do to solve this? Or which options would you consider to create the flipbook by replacing the Quad? Perhaps a UI element, but they don’t have a depth either and that’s what I need.

Please help :confused:

You can check this from 8 years ago. I basically want to do this, but in a 2D way. Perhaps using UI elements as if I have to use 3D objects like Quads… they won’t have depth.