Losing material connection between Dimension and Mixamo

Hay Folks, I'm trying to bring a 3D character model that has been texutred in dimention, into mixamo for applying animations, however when I bring the model into mixamo, the maerials have gone. if i bring in the same export back into dimention, the materials are still connected so i get the feeling the problem lies in Mixamo.

the only file types that are shared between both mixamo and dimention is OBJ, I know an fbx would probably have been better to use for keeping materials applied but I dont have that option in dimention. 

My intention is to use adobe throughout the workflow but this issue is making it difficult to do that. 

Any help much appreciated.

cheers guys!