Okay, these are actually two questions because they have to do with the same problem, I explain:
This is my first time in the engine and I wanted to try a little bit of global illumination, so I downloaded a one page castle model called Sketchfab, the problem is that I don't know how to deal with this gltf format thing, (adding textures to materials, etc) I don't even know how to make the model appear. I just have no idea how it works. Previously, all I did was move the model (obj format) to the screen, create a new resource (Spatial Material), etc. Now that doesn't seem to work.
I don't have English as my first language, so I'm sorry if it's not understood too much.