Questions about node material editor

When I used the custom model in the node material editor, the first UV unfolded in 3DMAX could not be recognized. At first, I thought there was an error in the export, but I put my model in the sandbox and found that my model UV was actually normal. It is just not recognized by the node material editor. My model has two sets of UVs.

You can choose to use the set of uvs you want on the uv block:

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Thank you for your answer, but I don’t mean that I don’t know how to use the second set of UV. I mean, my first set of UVs doesn’t seem to work in the node material editor. The second set of UVs is normal, but it is not used to sample my Ao map.

Can you setup a repro so that we can better see what’s going on?