So I’m having the problem listed in this forum topic.
Is there any word of a fix, beyond re generating normals/ tangents like it’s listed in the PDF. Currently it’s not that practical if there’s a great deal of objects and it voids that if you reimport.
Datasmith is unusable at the moment for me with this bug.
I’m using Unreal 4.22.3 and 3d studio max.
I also got it with Unreal 4.21, and 4.20