Help... Imported-object in After Effects to shiny!

Please help...

I am a newbie when it comes to importing an .obj into After Effect and am running into an annoying problem.

I have created a simple 3D model of unfolded book in Adobe Dimensions. On the top pages I placed a jpg representing a spread from a picture book. The material of these pages is a mat. In Dimensions, this goes well.

Once imported into After Effects as an .obj, the material is no longer matte, but far too glossy. I have played with different light sources in After Effects, but since I want to rotate the object a little bit, a moment always occurs when the pages become too

glossy. Texts and illustrations become irradiated and are no longer readable.

Doesn't an .obj include the material specifications (applied in Adobe Dimensions) when you import it into After Effects?

I realize that it is a crossover of 2 software programs , however, I do not know where the problem lies. Perhaps it is impossible to change or fix the matte material.
I asked the same question in the Adobe Dimensions community.

Does anyone have an idea what I am doing wrong?

Kind regards, Martin