diff --git a/app/admin/page.tsx b/app/admin/page.tsx
index 2fcdd61..edcc176 100644
--- a/app/admin/page.tsx
+++ b/app/admin/page.tsx
@@ -66,11 +66,18 @@ function CardTypeSelect({
   );
 }
 
-const isVideoUrl = (url: string) => /\.(mp4|webm|mov|m4v|ogv)(\?|$)/i.test(url);
+const VIDEO_EXTENSIONS = 'mp4|m4v|webm|mov|qt|mkv|avi|divx|wmv|asf|flv|f4v|3gp|3gpp|3g2|mts|m2ts|ts|mpg|mpeg|vob|mxf|ogv|ogg';
+// Sottoinsieme di formati video davvero riproducibili dai browser moderni
+const PLAYBACK_SUPPORTED_VIDEO = 'mp4|m4v|webm|mov|qt|ogv|ogg';
+const PLAYBACK_SUPPORTED_LABEL = 'MP4, M4V, WebM, MOV, OGV';
+
+const isVideoUrl = (url: string) => new RegExp(`\\.(${VIDEO_EXTENSIONS})(\\?|$)`, 'i').test(url);
 const isPdfFile = (file: File) =>
   file.type === 'application/pdf' || /\.pdf$/i.test(file.name);
 const isVideoFile = (file: File) =>
-  file.type.startsWith('video/') || /\.(mp4|webm|mov|m4v|ogv)$/i.test(file.name);
+  file.type.startsWith('video/') || new RegExp(`\\.(${VIDEO_EXTENSIONS})$`, 'i').test(file.name);
+const isPlayableVideoFile = (file: File) =>
+  new RegExp(`\\.(${PLAYBACK_SUPPORTED_VIDEO})$`, 'i').test(file.name);
 
 const extractFileName = (url: string): string => {
   const match = url.match(/[?&]name=([^&]+)/);
@@ -171,7 +178,7 @@ export default function AdminDashboard() {
   const [uploading, setUploading] = useState<{ [key: string]: boolean }>({});
 
   // NEW UI STATES: Toast and Confirm Dialog
-  const [toast, setToast] = useState<string | null>(null);
+  const [toast, setToast] = useState<{ message: string; type: 'success' | 'error' } | null>(null);
   const [confirmDialog, setConfirmDialog] = useState<{ message: string, onConfirm: () => void } | null>(null);
   const [pdfProgress, setPdfProgress] = useState<{ name: string; page: number; total: number } | null>(null);
 
@@ -179,9 +186,9 @@ export default function AdminDashboard() {
   const externalLinksOn = portal.externalLinkEnabled ?? EXTERNAL_LINK_DEFAULT;
 
   // Helper to show auto-dismissing toast
-  const showToast = (message: string) => {
-    setToast(message);
-    setTimeout(() => setToast(null), 3000);
+  const showToast = (message: string, type: 'success' | 'error' = 'success') => {
+    setToast({ message, type });
+    setTimeout(() => setToast(null), type === 'error' ? 6000 : 3000);
   };
 
   useEffect(() => {
@@ -217,8 +224,33 @@ export default function AdminDashboard() {
     let pendingCover: string | null = null;
     const canPromote = () => startedWithoutCover && !pendingCover;
 
-    const uploaded: MediaItem[] = [];
+    // Pre-filtro: scarta video con formati non riproducibili nei browser
+    const rejected: string[] = [];
+    const acceptedFiles: File[] = [];
     for (const file of Array.from(files)) {
+      if (isVideoFile(file) && !isPlayableVideoFile(file)) {
+        rejected.push(file.name);
+      } else {
+        acceptedFiles.push(file);
+      }
+    }
+    if (rejected.length > 0) {
+      const list = rejected.length <= 3
+        ? rejected.join(', ')
+        : `${rejected.slice(0, 3).join(', ')} e altri ${rejected.length - 3}`;
+      showToast(
+        `Formato non supportato! I formati supportati sono: ${PLAYBACK_SUPPORTED_LABEL}. File ignorati: ${list}`,
+        'error'
+      );
+    }
+    if (acceptedFiles.length === 0) {
+      setUploading(prev => ({ ...prev, extraMedia: false }));
+      e.target.value = '';
+      return;
+    }
+
+    const uploaded: MediaItem[] = [];
+    for (const file of acceptedFiles) {
       try {
         if (isPdfFile(file)) {
           const items = await pdfToImageItems(file, (page, total) =>
@@ -701,7 +733,7 @@ export default function AdminDashboard() {
                   <div className="border-2 border-dashed border-gray-300 rounded-lg p-3 hover:bg-gray-50 transition-colors">
                     <input
                       type="file"
-                      accept="image/*,video/*,application/pdf,.pdf"
+                      accept="image/*,video/*,application/pdf,.pdf,.mov,.qt,.mkv,.avi,.divx,.wmv,.asf,.flv,.f4v,.3gp,.3gpp,.3g2,.mts,.m2ts,.ts,.mpg,.mpeg,.vob,.mxf,.ogv,.ogg"
                       multiple
                       onChange={handleUploadExtraMedia}
                       className="block w-full text-sm text-gray-700 file:mr-4 file:py-2 file:px-4 file:rounded-full file:border-0 file:text-sm file:font-semibold file:bg-purple-50 file:text-purple-700 hover:file:bg-purple-100 cursor-pointer"
@@ -818,11 +850,15 @@ export default function AdminDashboard() {
 
       {/* CUSTOM TOAST NOTIFICATION */}
       {toast && (
-        <div className="fixed bottom-6 right-6 z-[70] bg-gray-900 text-white px-6 py-4 rounded-lg shadow-2xl flex items-center gap-3 animate-in slide-in-from-bottom-5 fade-in duration-300">
-          <div className="w-6 h-6 bg-green-500 rounded-full flex items-center justify-center text-gray-900 font-bold text-sm">
-            ✓
+        <div className={`fixed bottom-6 right-6 z-[70] text-white px-6 py-4 rounded-lg shadow-2xl flex items-start gap-3 animate-in slide-in-from-bottom-5 fade-in duration-300 max-w-md ${
+          toast.type === 'error' ? 'bg-red-700' : 'bg-gray-900'
+        }`}>
+          <div className={`w-6 h-6 rounded-full flex items-center justify-center font-bold text-sm shrink-0 mt-0.5 ${
+            toast.type === 'error' ? 'bg-white text-red-700' : 'bg-green-500 text-gray-900'
+          }`}>
+            {toast.type === 'error' ? '!' : '✓'}
           </div>
-          <span className="font-medium">{toast}</span>
+          <span className="font-medium leading-snug">{toast.message}</span>
         </div>
       )}
 
diff --git a/components/PublicGrid.tsx b/components/PublicGrid.tsx
index f0b4ccd..8006010 100644
--- a/components/PublicGrid.tsx
+++ b/components/PublicGrid.tsx
@@ -2,7 +2,8 @@
 import { useState, useEffect, useCallback, useRef } from 'react';
 import { Card, MediaItem } from '@/types';
 
-const isVideoUrl = (url: string) => /\.(mp4|webm|mov|m4v|ogv)(\?|$)/i.test(url);
+const VIDEO_EXTENSIONS = 'mp4|m4v|webm|mov|qt|mkv|avi|divx|wmv|asf|flv|f4v|3gp|3gpp|3g2|mts|m2ts|ts|mpg|mpeg|vob|mxf|ogv|ogg';
+const isVideoUrl = (url: string) => new RegExp(`\\.(${VIDEO_EXTENSIONS})(\\?|$)`, 'i').test(url);
 
 function MediaCarousel({
   items,