local part = Instance.new("Part", workspace)
local mesh = Instance.new("SpecialMesh", part)
mesh.MeshType = Enum.MeshType.FileMesh
mesh.MeshId = "rbxassetid://430345785"
Mesh appears to be invisible; I can stand on it. I really can't find the problem... please help!

2 comments
It probably failed to load
I ran it multiple times though. Is there a way to fix this?