Hello!
I noticed such an error when exporting in SKP:
If on 3D models (ATLO) the textures are binding not UV, but orthogonal, goizontal, etc., then these textures disappear when exporting to SKP format.
If the textures have a UV, then all the textures are in place.
What could be the reason?
Or are the SKP export only textures with the UV?