Effectively modify the uv coordinates of the imported mesh?

Questions
1

I’m trying to do something. I imported a model externally, and I want to modify the uv of this mesh.I did not succeed, but I printed the uv of the mesh after modification, the data was changed, but the texture did not change :思维:
https://www.babylonjs-playground.com/#JUKXQD#497

2

Use the inspector and view the nodes. You will see that newMeshes[0] is not a mesh (no bounding box or eye icon). When importing it is always important to use the inspector to check out the structure. One mesh can turn out to be many and have a parent and child structure.
Using newMeshes[1]
https://www.babylonjs-playground.com/#JUKXQD#501

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