Hello, Thank you for your patience.
To start there is a way to see how many UV channels the mesh has in Clara.
for this example i'll be using your "Sphere":
- Click on the mesh you want
The Mesh "Sphere" has default and UV2
With this information you can add one of those 2 UV channels to the maps you want in the Material Property.
Keep in mind that if you change the UV Channel it will not show in the scene...
only in "V2"
you access this by going on the upper left
-Open View V2 (Beta)
Hope this helped answer you question.
Visual of the Example: