Question Adobe Substance 3D Runtime in Webgl

Does Unity support updating of substance graph inputs at runtime in WebGl?

I am trying to implement this:
https://substance3d.adobe.com/docum...d-for-unity-scripting-232292391.html#section3

It works in the editor and a PC/desktop build, but in WebGL I get an error:

"ArgumentException: No Substance Input found with name..."

I also see this error:
"A scripted object (probably Adobe.Substance.SubstanceGraphSO?) has a different serialization layout when loading. (Read 812 bytes but expected 3708 bytes)
Did you #ifdef UNITY_EDITOR a section of your serialized properties in any of your scripts?"

But I think the second error is unrelated.