How can I export as an obj file, but keep the brickcolours?

so I have a floor plan I made in studio, and I tried to export it to TinkerCad.


the problem is, when I import it to TinkerCad, it combines into one solid colour.

is there a way to fix this? the only way I have thought of is exporting every colour one by one and combining them inside tinkercad, but if anyone has a better solution that would be much apreciated, thanks!

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