Apologies if this is in the wrong place.
Newbie to Substance, wanting to start practicing on a mesh I have, checked the backfacing cull in 3DS Max and it seems to be fine. However when importing the mesh as an FBX in Substance Painter, some mesh items like this door are missing.

For curiosity sake I tried flipping the polygons on the door and importing it again as an FBX to Substance Painter - the mesh then appears as it should but darker than the rest of the mesh, any ideas as to what I'm doing wrong would be appreciated.
