Scene import (material instance problem)

Hello.
I have a parent material, and I’ve produced many instances. When I want to import scene, I show the location of my material folder.
If my folder is composed of normal materials, it’s fine.
When the instance is in the material, unreal shows that it sees and uses it. But when I import the scene, it transfer without the material and materials are formed in my Material folder.
This doesn’t happen if I select the materials manually but it’s a very demanding task.

Thanks.

My problem still goes on. Please help.

Thanks.

Hello,

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Thanks

Problem solved with 4.20. However, this time the scene import after the mesh 1. Lightmap is seeing the UV.