Problem is that you don’t have a texture on your material in blender. I just checked out your file.
To get things working how you want you’ll have to do the following in blender.
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Create another material for the seat cushion. Go into edit mode and assign the vertices for the cushion in the material panel in properties.
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Now you’ll need to add the textures to your two materials. Click the checkered box icon right next to the materials icon in the properties panel in blender. Click new to add a texture and under the ‘Image’ section to select the texture for each material