An asset can look correct in its source application and still fail after import into Substance 3D Painter. Treat coordinate policy as a translation problem between tools, with unit scale and up and forward axes checked on both sides.
For Substance 3D Painter, choose one authoritative unit scale, up axis, forward axis, and origin policy. Apply that convention at export time, then verify transforms and up and forward axes after a clean re-import.
Write down the unit scale, up axis, forward axis, origin, and transform-baking rule before assets enter the shared library. Apply this coordinate policy guidance to the actual Substance 3D Painter delivery path.