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UVs are handled in the program creating the model (in this case Sketchup). Please look up some tutorials for UVs in Sketchup as we do not have official support or tutorials for 3rd party programs. Dimension cannot provide or fix UVs at this time, it is just able to detect and warn that this is an issue.
I am afraid that a lot of people find this frustrating including myself.
Is there really nothing that you can do?
Long term, of course! We have a lot of initiatives around automatically fixing UV errors and can eventually expose tools to give users manual control over UVs directly in Dimension if needed. Short term though, there's not much I can do. There are too many 3rd party softwares out there for me to give instructions and they vary for each tool out there.