How can I access pre-existing UV maps in an fbx? I am trying to clean up some mistakes in an fbx model that I have and it would help tremendously if I could access the pre-existing UV maps in the model. 

My outliner shows one mesh with multiple materials that have multiple textures underneath it.



I want to access the UV map for one of these textures.

Unfortunately, the UV/Image Editor shows one ridiculously complicated UV map that combines the UV maps of all the textures.



How can I select just the one UV map that comes with only one of the textures?
All existing UV maps can be accessed by simply selecting them in the Properties Editor, Data tab in the UV map list. They will be previewed in the viewport when selected, and you need to select the active one for rendering by clicking the camera icon:



When you need to use a few UV maps in a shader, you can specify the vector input for any texture to be the correct UV map with the node not so surprisingly called 'UV Map':