Thanks for pointing us in the right direction. I’ve got the feature working again on our end on a very basic and stripped-down version of our master material (we did have some slight modifications in place that didn’t fully get through when we upgraded the plugin). We can now move forward again to see where the material breaks down and is not saved correctly. I will report back if the cause of the issue is worth mentioning or if it has something to do with the plugin. But I’m pretty sure it has something to do with something somewhere in our material asset (possibly broken by Epic by upgrading to 5.0)