How to assign XR interaction tool scripts to asset bundles?

I am trying to load asset bundles from server. Before creating asset bundles I attached ARSelectionInteractable,ARTranslationInteractable etc scripts to prefab and then converted to asset bundle but looks like the script does not work when asset bundle is downloaded.

I also tried to attach scripts programmatically once asset bundle is downloaded but doesn't seem to work. Any help

 _placementInteractable.placementPrefab  = Instantiate(bundle.LoadAsset(rootAssetPath) as GameObject,transform);
 _placementInteractable.placementPrefab.AddComponent<BoxCollider>();
                   _placementInteractable.placementPrefab.AddComponent<ARSelectionInteractable>();
                   _placementInteractable.placementPrefab.AddComponent<ARTranslationInteractable>();
                   _placementInteractable.placementPrefab.AddComponent<ARScaleInteractable>();
                   _placementInteractable.placementPrefab.AddComponent<ARRotationInteractable>();

I am following this eg https://github.com/Unity-Technologies/XR-Interaction-Toolkit-Examples but it only demonstrates already present prefabs eg and not one downloaded from server. I am testing on m iPhone device

,I am trying to load asset bundles from server. Before creating asset bundles I attached ARSelectionInteractable,ARTranslationInteractable etc scripts to prefab and then converted to asset bundle but looks like the script does not work when asset bundle is downloaded.

I also tried to attach scripts programmatically once asset bundle is downloaded but doesn't seem to work. Any help

 placementInteractable.placementPrefab  = Instantiate(bundle.LoadAsset(rootAssetPath) as GameObject,transform);
 _placementInteractable.placementPrefab.AddComponent<BoxCollider>();
                   _placementInteractable.placementPrefab.AddComponent<ARSelectionInteractable>();
                   _placementInteractable.placementPrefab.AddComponent<ARTranslationInteractable>();
                   _placementInteractable.placementPrefab.AddComponent<ARScaleInteractable>();
                   _placementInteractable.placementPrefab.AddComponent<ARRotationInteractable>();

I am following this eg https://github.com/Unity-Technologies/XR-Interaction-Toolkit-Examples but it only demonstrates already present prefabs eg and not one downloaded from server. I am testing on m iPhone device