Other Referencing textures from FBX files automatically through editor script

Hello,

I'm trying to create addressables automatically when importing FBX files to my project through editor scripts. It all works fine except for the textures, I am not able to reference the textures to the corresponding materials.
I have tried to export the textures through ModelImporter, which exports the textures correctly to a folder but without references and I have also tried with OnPreprocessMaterialDescription but in this case the texture is always null.
Is there anyone who can help me?

Thanks!