Hey [USER=“3140864”]MostHost LA[/USER] thanks for the reply – two replies in a weekend – really appreciate it.
I was compiling a multi component model from Blender to Substance to Unreal, and was hoping to avoid exporting two texture sets at once (ie. having one model in Unreal and one general model for Sketchfab upload / Blender). Maybe the right workflow would have been to export the materials for Blender, then export the FBX from Blender?
Anyway appreciate the clarification and will do the test if I get around to it today.