How to use the wagtailmedia.permissions.permission_policy.user_has_permission function in wagtailmedia

return render(request, 'wagtailmedia/media/results.html', {
            'ordering': ordering,
            'media_files': media,
            'query_string': query_string,
            'is_searching': bool(query_string),
        })
    else:
        return render(request, 'wagtailmedia/media/index.html', {
            'ordering': ordering,
            'media_files': media,
            'query_string': query_string,
            'is_searching': bool(query_string),

            'search_form': form,
            'popular_tags': popular_tags_for_model(Media),
            'user_can_add': permission_policy.user_has_permission(request.user, 'add'),
            'collections': collections,
            'current_collection': current_collection,
        })