The archive has two separate archives for the 3ds file and OBJ.

All objects have logical names and a group, Turbosmoth - enabled during rendering and assigned to a group. For perfect smoothing Turbosmoth is set to 2. Also in the scene there are separate objects on which all materials are superimposed.

The model has a very extensive color palette, the materials are made so that you can adjust the color of the fabric yourself, for this you need to replace the main texture superimposed on the Diffuse color with the name Color _ ** with CoronaColor and customize it to your taste. The screen and sofa have different textures, so two types of material are provided in the scene.

https://martela.com/contract-furniture/easy-chairs-sofas/podsofa-sofa