Migrating Substance assets between project

Hello everyone,

So I imported and applied a bunch of the materials that come with the Unreal Studio beta subscription through Substance. Because I wanted to apply an Opacity Mask to these materials I modified all of them in my project. The thing is I want to use these modified materials for my next project as well, but it seems like the ‘Migrate’ function does not seem to copy properly. Only the actual materials are copied to the new project, meaning it loses all its assocations to any textures, normal maps, etc.
The weird thing is that when I look at the folder in Windows Explorer it seems like everything has been copied, but in the project it does not.

Does anyone know of a proper way to move Substance Materials between projects?