diff --git a/pixelle_video/services/frame_html.py b/pixelle_video/services/frame_html.py
index ae3bcd9..5861cba 100644
--- a/pixelle_video/services/frame_html.py
+++ b/pixelle_video/services/frame_html.py
@@ -200,9 +200,8 @@ class HTMLFrameGenerator:
                 }
             }
         """
-        # Preset parameters that should be ignored
-        PRESET_PARAMS = {'title', 'text', 'image', 'content_title', 'content_author', 
-                        'content_subtitle', 'content_genre'}
+        # Preset parameters that should be ignored (auto-injected by system)
+        PRESET_PARAMS = {'title', 'text', 'image', 'index'}
         
         # Pattern: {{param_name:type=default}} or {{param_name=default}} or {{param_name:type}} or {{param_name}}
         # Param name: must start with letter or underscore, can contain letters, digits, underscores
diff --git a/pixelle_video/services/frame_processor.py b/pixelle_video/services/frame_processor.py
index a5068be..c26a9fb 100644
--- a/pixelle_video/services/frame_processor.py
+++ b/pixelle_video/services/frame_processor.py
@@ -293,15 +293,9 @@ class FrameProcessor:
         content_metadata = storyboard.content_metadata if storyboard else None
         
         # Build ext data
-        ext = {}
-        if content_metadata:
-            ext["content_title"] = content_metadata.title or ""
-            ext["content_author"] = content_metadata.author or ""
-            ext["content_subtitle"] = content_metadata.subtitle or ""
-            ext["content_genre"] = content_metadata.genre or ""
-        
-        # Add frame index (1-based)
-        ext["index"] = frame.index + 1
+        ext = {
+            "index": frame.index + 1,
+        }
         
         # Add custom template parameters
         if config.template_params:
diff --git a/web/components/style_config.py b/web/components/style_config.py
index 889998a..e92037d 100644
--- a/web/components/style_config.py
+++ b/web/components/style_config.py
@@ -521,12 +521,21 @@ def render_style_config(pixelle_video):
                         template_path = resolve_template_path(frame_template)
                         generator = HTMLFrameGenerator(template_path)
                         
-                        # Generate preview (use custom parameters from video generation section)
+                        # Build ext dict with auto-injected parameters (same as FrameProcessor)
+                        ext = {
+                            "index": 1,  # Preview uses index 1
+                        }
+                        
+                        # Add custom parameters from user input
+                        if custom_values_for_video:
+                            ext.update(custom_values_for_video)
+                        
+                        # Generate preview
                         preview_path = run_async(generator.generate_frame(
                             title=preview_title,
                             text=preview_text,
                             image=preview_image,
-                            ext=custom_values_for_video if custom_values_for_video else None
+                            ext=ext
                         ))
                         
                         # Display preview