> Quote - the texture maps need to be in the same folder as the obj and mtl file.

A sub-folder also works fine for me. The texture map references in the mtl file must of course include the sub-folder name.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)