Why is my Avatar not connected to my mesh?

Apologies I am new to unity. I imported an asset from the asset store, it is a character with all the animations and all that. So I created an empty object, I added a mesh filter and mesh render er to this object. I applied the character's model to the filter and I applied a material to the mesh render er but when I add an animator with the asset's avatar and my own animation controller (assets controller also does not work) and I click play the mesh stays still while when I have my character selected I can see the red and blue joints not connected to anything moving around.