123d design model export not working correctly.

Hello. I am making a game in unity 5 and i found a model creator that finally i understand. 123D Design i export it grouped but not combined with meterials. As stl then exporting it instantly to Meshmixer and from that instantly to obj. Its a success but it dosent show textures on the model i made in 123d design and other pieces that was grouped i need them grouped not combined because i will make animations on some parts that is in the group. Any idea why its happening like that? Maybe i am exporting it wrong then how do i export model from 123d design with materials? Sorry about wrong tag it dosent show me what tags i can use!.

Never heard of 123Design, but (while it is widely supported) .obj is a dated and rather simplistic file format - it only encodes mesh data, not materials or animations. Can you export as .FBX instead?

Autodesk 123Design is one of the most complicated 3d modeling softwares, so is Blender.
I suggest you use this list, and chose to use one of those.