I try to create my own assets. And I always get the same error when I save.
CF image attached.
I tried to change the names and paths but nothing works.
Also it is impossible to place the textures correctly in the asset editor.
The only way to get correctly positioned textures is to import the model in .obj. But unfortunately each polygon creates its own texture. That you have to modify one by one. Impossible if the object contains hundreds of polygons.
As it is, it's difficult to use this editor which seems to be very little advanced in development.