diff --git a/api/scanner.py b/api/scanner.py
index 2501e0f..4003e9c 100644
--- a/api/scanner.py
+++ b/api/scanner.py
@@ -151,6 +151,7 @@ async def api_scan_all(request):
     virtual_rename = data.get("virtual_rename", False)
     physical_rename = data.get("physical_rename", False)
     force_overwrite = data.get("force_overwrite", False)
+    skip_media = data.get("skip_media", False)
     
     try:
         with open(marker_file, 'w') as f: f.write('1')
@@ -165,7 +166,7 @@ async def api_scan_all(request):
                         for base_dir in paths:
                             if not os.path.exists(base_dir): continue
                             print(f"[Anomalous Browser] Global scan processing: {base_dir}")
-                            cmd = [sys.executable, scraper_path, base_dir, "--skip-media"]
+                            cmd = [sys.executable, scraper_path, base_dir]
                             if offline_only:
                                 cmd.append("--offline-only")
                             if skip_rename:
@@ -176,6 +177,8 @@ async def api_scan_all(request):
                                 cmd.append("--physical-rename")
                             if force_overwrite:
                                 cmd.append("--force-overwrite")
+                            if skip_media:
+                                cmd.append("--skip-media")
                             if not use_local_metadata:
                                 cmd.append("--skip-local-metadata")
                             subprocess.run(
diff --git a/scraper.py b/scraper.py
index 36637bd..969623d 100644
--- a/scraper.py
+++ b/scraper.py
@@ -408,14 +408,24 @@ def main():
                         print(f"[+] 媒体下载成功 -> {os.path.basename(saved_path)}")
                         # Promote to .preview if no custom cover exists
                         has_custom = False
-                        for c_ext in ['.preview.png', '.preview.jpg', '.preview.jpeg', '.preview.webp', '.preview.gif', '.preview.avif', '.preview.mp4', '.preview.webm', '.preview.mov', '.preview.avi', '.png', '.jpg', '.jpeg', '.webp', '.gif', '.avif', '.mp4', '.webm', '.mov', '.avi']:
-                            p = old_base + c_ext
-                            if os.path.exists(p) and not p.endswith('.civitai_bak' + c_ext):
-                                has_custom = True
-                                break
+                        if not args.force_overwrite:
+                            for c_ext in ['.preview.png', '.preview.jpg', '.preview.jpeg', '.preview.webp', '.preview.gif', '.preview.avif', '.preview.mp4', '.preview.webm', '.preview.mov', '.preview.avi', '.png', '.jpg', '.jpeg', '.webp', '.gif', '.avif', '.mp4', '.webm', '.mov', '.avi']:
+                                p = old_base + c_ext
+                                if os.path.exists(p) and not p.endswith('.civitai_bak' + c_ext):
+                                    has_custom = True
+                                    break
                         if not has_custom:
                             ext = os.path.splitext(saved_path)[1]
                             import shutil
+                            if args.force_overwrite:
+                                for c_ext in ['.preview.png', '.preview.jpg', '.preview.jpeg', '.preview.webp', '.preview.gif', '.preview.avif', '.preview.mp4', '.preview.webm', '.preview.mov', '.preview.avi', '.png', '.jpg', '.jpeg', '.webp', '.gif', '.avif', '.mp4', '.webm', '.mov', '.avi']:
+                                    p = old_base + c_ext
+                                    if os.path.exists(p) and not p.endswith('.civitai_bak' + c_ext):
+                                        try:
+                                            os.remove(p)
+                                            print(f"[*] 强制覆盖: 已删除旧预览文件 {os.path.basename(p)}")
+                                        except:
+                                            pass
                             preview_ext = ext if ext.startswith('.preview.') else f".preview{ext}"
                             shutil.copy2(saved_path, old_base + preview_ext)
                 else:
diff --git a/web/main.js b/web/main.js
index a18d340..d0cc894 100644
--- a/web/main.js
+++ b/web/main.js
@@ -887,7 +887,7 @@ class AnomalousBrowser {
             document.body.appendChild(wizard);
         };
 
-        scanBtn.onclick = () => createWizardModal();
+        scanBtn.onclick = () => createWizardModal(true);
         this.sidebarActions.appendChild(scanBtn);
 
         const energyBtn = document.createElement('button');