In Blender 2.8, working from a new file, I have created a mesh circle and extruded it into a cylinder. I then attempt to apply a texture using settings that work on cubes and cylinders. But in the case of the extruded circle, the texture does not appear (in Render mode).
My question: what do I need to do to get the texture to appear on the extruded circle?
You need to UV Map the extruded cylinder. The reason why textures appear on a cylinder (and cube) created from the Add menu is because those are basic shapes that are used a lot, so they are already set up (which means UV mapped) for using textures, but since you extruded your cylinder from a circle, it doesn't have a UV map yet. I suggest looking up tutorials on the internet on how to learn to UV map models, because it is a very important thing to know.
UV mapping a cylinder is trivial, any basic tutorial will do.
