I just did a basic test by just add a empty directory in the asset directory of my sandbox. SHame that did not work.
And we really need directories to keep the choas under control and start seperating textures from the mesh, so it can be reused. Without directories you better not start to build something more then testing. Without directories i could not start testing with seperate textures outside the FBX file.
But how can we make directories ?
I have seen it with the default sandbox content.
Mabye the trick is in the json file ? but then we nee documentation how you add a directory. Yes, the whole ATP need a makeover.