Heya Eric, The Blender terminology is a bit unclear, probably coming from earlier legacy development. "Autosmooth" simply means that smoothing is applied to the object with an optional threshold for hard edge shading from 0 to 180 degrees (30 being the default). First and foremost this requires the model to being flagged…
I wonder why you're using the Auto Smooth option in Blender? That would seem to be overwriting the incoming vertex normals? About synching: The glTF specification says renderers should use MikkTSpace tangent space with the OpenGL X-right Y-up convention to render a model with normal maps on it. Which means the baker needs…