diff --git a/api/version/media-url_debug.log b/api/version/media-url_debug.log
index 6dda3ea..633f574 100644
--- a/api/version/media-url_debug.log
+++ b/api/version/media-url_debug.log
@@ -9,3 +9,6 @@
 [2026-01-21 14:09:48] Request: GET /api/version/media-url.php?id=2690520987949889 GET:{"id":"2690520987949889"} POST:[]
 [2026-01-21 14:09:48] Graph API request to https://graph.facebook.com/v22.0/2690520987949889
 [2026-01-21 14:09:49] Proxying Facebook media URL with Authorization to https://lookaside.fbsbx.com/whatsapp_business/attachments/?mid=2690520987949889&source=getMedia&ext=1769022879&hash=ARmZNGo6nPUMqsu1WVi5OGDOIQucpHkU45UcMnR0kudP2Q
+[2026-01-21 14:14:06] Request: GET /api/version/media-url.php?id=3932473397057815 GET:{"id":"3932473397057815"} POST:[]
+[2026-01-21 14:14:06] Graph API request to https://graph.facebook.com/v22.0/3932473397057815
+[2026-01-21 14:14:07] Proxying Facebook media URL with Authorization to https://lookaside.fbsbx.com/whatsapp_business/attachments/?mid=3932473397057815&source=getMedia&ext=1769023137&hash=ARlu_MCLx6NJCX8mxWXoqSxQ5jNO5lfqPV3wj5mAfq0qAQ
diff --git a/chat_window.php b/chat_window.php
index 2e43238..d83e128 100644
--- a/chat_window.php
+++ b/chat_window.php
@@ -613,7 +613,20 @@ if (empty($user_id)) {
                             } else if (isValidMediaUrl(msg.local_file)) {
                                 thumbUrl = `/${msg.local_file}`;
                             } else if (isValidMediaUrl(msg.media_url_external)) {
-                                thumbUrl = msg.media_url_external;
+                                // Si es una URL externa de Facebook/lookaside, usar el proxy para incluir Authorization
+                                const external = msg.media_url_external;
+                                if (/lookaside\.fbsbx\.com|graph\.facebook\.com|facebook\.com/i.test(external)) {
+                                    // Intentar extraer mid del query string para usar ?id=
+                                    const midMatch = external.match(/[?&]mid=([^&]+)/i);
+                                    if (midMatch && midMatch[1]) {
+                                        const mid = decodeURIComponent(midMatch[1]);
+                                        thumbUrl = `/api/version/media-url.php?id=${encodeURIComponent(mid)}`;
+                                    } else {
+                                        thumbUrl = `/api/version/media-url.php?url=${encodeURIComponent(external)}`;
+                                    }
+                                } else {
+                                    thumbUrl = external;
+                                }
                             } else if (isValidMediaUrl(msg.media_url)) {
                                 thumbUrl = msg.media_url;
                             }