UR20 upperarm.dae is broken

[dipendras]

The material of upperarm.dae file of UR20 is broken.

<triangles material="UR20_DIFF_8bit_2K_png_002-material" count="938">

material UR20_DIFF_8bit_2K_png_002-material doesn't exist.

Moreover,

<instance_geometry url="#Cylinder_018-mesh" name="shoulder-mesh_004"/>

Threre is no bind material in this mesh.

The fix could be to use the material UR20_DIFF_8bit_2K_png_002-material and include a bind material in shoulder-mesh_004 as follows:

<triangles material="UR20_DIFF_8bit_2K_png-material" count="938">

         <instance_geometry url="#Cylinder_018-mesh" name="shoulder-mesh_004">
            <bind_material>
                <technique_common>
                    <instance_material symbol="UR20_DIFF_8bit_2K_png-material" target="#UR20_DIFF_8bit_2K_png-material">
                        <bind_vertex_input semantic="Cylinder_029-mesh-map-0" input_semantic="TEXCOORD" input_set="0"/>
                    </instance_material>
                </technique_common>
            </bind_material>
        </instance_geometry>