THREE.js won't to load my .mtl and .obj file

I'm trying to create a 3d model viewer by using three.js but it won't load any .mtl and .obj files. I followed this tutorial https://manu.ninja/webgl-3d-model-viewer-using-three-js/ but it only loads the female model.

This is my script:

            var mtlLoader = new THREE.MTLLoader();
            mtlLoader.setBaseUrl('models/rayman2');
            mtlLoader.setPath('models/rayman2');
            mtlLoader.load('rayman_2_mdl.mtl', function (materials) {

                materials.preload();

                materials.materials.default.map.magFilter = THREE.NearestFilter;
                materials.materials.default.map.minFilter = THREE.LinearFilter;

                var objLoader = new THREE.OBJLoader();
                objLoader.setMaterials(materials);
                objLoader.setPath('models/rayman2');
                objLoader.load('rayman_2_mdl.obj', function (object) {

                    object.position.x = 0;
                    object.position.y = 0;
                    object.position.z = 0;
                    scene.add(object);

                }, null, null);

            });

You can convert the file to glTF here, then load it as follows:

var loader = new THREE.GLTFLoader();
loader.load('rayman.glb', function (gltf) {
  var content = gltf.scene;
  content.traverse((node) => {
    if (!node.isMesh) return;
    node.material.side = THREE.DoubleSide;
    node.material.alphaTest = 0.25;
    node.material.needsUpdate = true;
  });
  scene.add(content);
}, undefined, function (e) {
  console.error(e);
});

The conversion to glTF just simplifies things. The other changes fix issues in the model: THREE.DoubleSide ensures that both sides of the character's hair are visible, and alphaTest ensures that the transparency in the texture appears correctly.

See docs for THREE.Material and THREE.GLTFLoader.

three.js r92.