Texture and 3D Object problem in FS2020

Did you read the documentation about aircraft modelling? Naming of objects for example is pretty important.

https://docs.flightsimulator.com/html/mergedProjects/How_To_Make_An_Aircraft/Contents/Modelling/Modelling_And_Texturing.htm

Also, don’t use the Babylon exporter, but the provided MSFS exporter that comes with the SDK.

https://docs.flightsimulator.com/html/mergedProjects/How_To_Make_An_Aircraft/Contents/Modelling/Model_Exporting.htm