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If you just edit the texture files, those changes will be recognized by the OBJ and MTL files. They will show up in the game automatically without you having to do anything else.
From what you said, I assume you made changes to the Sketchup model (SKP file)? In that case, you need to run OBJexporter extension in Sketchup. That will rebuild the OBJ and MTL properly. Then you will see the changes in the game.
If this doesn't answer your question, let us know what you mean by "add something new".
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