title: Mapbox Android SDK: Add makers using symbolManager
body: <p>I'm trying to add multiple markers using Mapbox Android SDK and using symbolManager as recommended <a href="https://docs.mapbox.com/android/plugins/overview/annotation/" rel="nofollow noreferrer">here</a>.</p>
  
  <p>I just create this function which is responsible to create one marker for each car object. I don't get any error but nothing is displayed on the map.</p>
  
  <pre><code>private fun displayCarsLayer(cars: MutableList&lt;Car&gt;) {
  
          mapView.getMapAsync(OnMapReadyCallback { mapboxMap -&gt;
              for (car in cars) {
                  val carLat = car.lat
                  val carLng = car.lng
                  // Add the marker to the map
                  symbolManager.create(
                      SymbolOptions()
                      .withLatLng(LatLng(carLat, carLng))
                  );
              }
          })
  
      }
  </code></pre>