Problem: the AR button on iOS doesn't appear

[dmnbme]

Description

I enabled webAR, quicklook, and filled iosSrc, but the AR button does not appear.

My codes

onMounted(() => {
      view3D = new View3D(viewerContainer.value, {
        src: props.modelUrl,
        canvas: canvasElement.value,
        wheelScrollable: true,
        pitch: 30,
        yaw: -30,
        iosSrc: "/model/example.usdz",
        webAR: true,
        quickLook: true
      });

I wonder if something I've done was wrong.