Help needed with applying texture to obj

Questions
1

Hello everybody… I searched a lot before opening this topic…
My process is next:
I download stl file, using online converters i convert it to obj, if Im using default OBJ file from tutorial, texture is applied, but with mine: no.

Working file: https://inaf.ba/eldin-aquabalkan/avion.obj
Not working file: https://inaf.ba/eldin-aquabalkan/macaron.obj

this is how i tried to load model

function onModelLoaded() {
		object.traverse( function ( child ) {
			let mat = new THREE.MeshPhongMaterial( { color: 0x171511, specular: 0xD0CBC7, shininess: 5, flatShading: true } );

      const texture = new THREE.TextureLoader().load( 'https://inaf.ba/eldin-aquabalkan/media/site/7df2d4cd5a-1643637763/slider-1.jpg' );
      const material = new THREE.MeshBasicMaterial( { map: texture } );

      child.material = material;

      
		});

		setupAnimation(object);
	}

and version 2

function onModelLoaded() {
		object.traverse( function ( child ) {
			let mat = new THREE.MeshPhongMaterial( { color: 0x171511, specular: 0xD0CBC7, shininess: 5, flatShading: true } );

      const texture = new THREE.TextureLoader().load( 'https://inaf.ba/eldin-aquabalkan/media/site/7df2d4cd5a-1643637763/slider-1.jpg' );
      const material = new THREE.MeshBasicMaterial( { map: texture } );


      if (child instanceof THREE.Mesh) {
        for ( var i = 0; i < child.material.length; i ++ ) {
          child.material[i].map = material;
       }
     }

		});

		setupAnimation(object);
	}

Thanks in advance