Assigning materials is described in the manual. You do not need automaterial unless your entity has no action. There are 4 entity and material textures, <entSkin1>..<entSkin4> and <mtlSkin1>..<mtlSkin4>. There is no <cylinder1_sep4_> texture in a shader.

If you have no experience with shaders and materials, read the manual first. Before storing a shader in a model, test it with a material effect. If a specific shader does not work, you could ask for help in the shader forum - however all AUM shaders are tested.