I have currently modeled some seats on blender which I tried to import into roblox studio. I exported individual cushions but it still wouldn’t import because of the triangle limit. It also doesn’t look like it has that many polygons
Your asset seems to be using a lot of redundant geometry. Consider using the Decimate Modifier set to Planar to make the object a lot more efficient and performance friendly. You could then use Smooth Shading to make it look a bit more like a cushion, if that’s the art style you’re going for.