I just downloaded the Unreal engine and tried uploading several assets, and the texture of the floor is weird. Walls and chairs look intact, but only the floor is flashing. How do you fix this?
You have 2 meshes occupying the same space in the world on the Z axis
Your computer can’t decide which on should be displayed, so it shows parts of the polygons of both meshes randomly. (Sometimes called z-fighting)
Move your floor tile mesh slightly higher and it will start working.