diff --git a/src/app/components/DeviceDetailOverlay.tsx b/src/app/components/DeviceDetailOverlay.tsx
index eac3d25..cc7d331 100644
--- a/src/app/components/DeviceDetailOverlay.tsx
+++ b/src/app/components/DeviceDetailOverlay.tsx
@@ -148,6 +148,17 @@ export default function DeviceDetailOverlay({
     updateDeviceSetting([...path, 'url'], file);
   };
 
+  const isOutsideBase = (url: string, baseUrl: string): boolean => {
+    if (!baseUrl || !url.startsWith('/')) return false;
+    const normalizedBase = baseUrl.endsWith('/') ? baseUrl : baseUrl + '/';
+    return url !== baseUrl && !url.startsWith(normalizedBase);
+  };
+
+  const clearBaseAndCache = (dev: any) => {
+    if ('base_url' in dev) dev.base_url = '';
+    if ('cache' in dev) dev.cache = '';
+  };
+
   const handleFileSelect = async (selectedPath: string) => {
     const devicePath = getDevicePath();
     if (selectedPath.toLowerCase().endsWith('.lst')) {
@@ -168,7 +179,8 @@ export default function DeviceDetailOverlay({
         const newConfig = JSON.parse(JSON.stringify(config));
         let dev = newConfig;
         for (const k of devicePath) dev = dev[k];
-        dev.url      = files[0];
+        if (isOutsideBase(files[0], dev.base_url || '')) clearBaseAndCache(dev);
+        dev.url       = files[0];
         dev.media_set = files;
         setConfig(newConfig);
       } catch (e: any) {
@@ -178,6 +190,7 @@ export default function DeviceDetailOverlay({
       const newConfig = JSON.parse(JSON.stringify(config));
       let dev = newConfig;
       for (const k of devicePath) dev = dev[k];
+      if (isOutsideBase(selectedPath, dev.base_url || '')) clearBaseAndCache(dev);
       dev.url = selectedPath;
       delete dev.media_set;
       setConfig(newConfig);
@@ -342,8 +355,14 @@ export default function DeviceDetailOverlay({
                     type="text"
                     value={deviceData.url}
                     onChange={(e) => {
-                      const path = getDevicePath();
-                      updateDeviceSetting([...path, 'url'], e.target.value);
+                      const newUrl = e.target.value;
+                      const devicePath = getDevicePath();
+                      const newConfig = JSON.parse(JSON.stringify(config));
+                      let dev = newConfig;
+                      for (const k of devicePath) dev = dev[k];
+                      if (isOutsideBase(newUrl, dev.base_url || '')) clearBaseAndCache(dev);
+                      dev.url = newUrl;
+                      setConfig(newConfig);
                     }}
                     className="flex-1 px-3 py-2 border border-neutral-300 rounded-lg"
                   />