Update app.py

app.py

@@ -440,7 +440,7 @@ def create_360_viewer_html(image_paths, audio_paths, output_path):
         <a-entity id="avion-contenedor">
             <a-entity id="modelo-avion" scale="4.5 4.5 4.5">
                 <a-entity paper-plane-mesh></a-entity>
-                <a-cone id="propulsion-glow" position="0 -0.15 -1.4" rotation="90 0 0" radius-bottom="0.25" radius-top="0" height="0.8" material="color:#ff7300; emissive:#ff3700; intensity: 2; transparent: true; opacity: 0.85;"></a-cone>
+                <a-cone id="propulsion-glow" visible="false"  position="0 -0.15 -1.4" rotation="90 0 0" radius-bottom="0.25" radius-top="0" height="0.8" material="color:#ff7300; emissive:#ff3700; intensity: 2; transparent: true; opacity: 0.85;"></a-cone>
             </a-entity>
         </a-entity>
     </a-scene>