diff --git a/api/version/media-url.php b/api/version/media-url.php
index 1e11cd3..5cf8126 100644
--- a/api/version/media-url.php
+++ b/api/version/media-url.php
@@ -7,6 +7,19 @@
  */
 require_once __DIR__ . '/../../config/config.php';
 
+// Debugging helpers: log errors to a file and initialize control vars
+error_reporting(E_ALL);
+ini_set('display_errors', '0');
+ini_set('log_errors', '1');
+ini_set('error_log', __DIR__ . '/media-url_error.log');
+
+function media_log($msg) {
+    @file_put_contents(__DIR__ . '/media-url_debug.log', date('[Y-m-d H:i:s] ') . $msg . PHP_EOL, FILE_APPEND | LOCK_EX);
+}
+
+$resolvedFromGraph = false;
+$decoded = null;
+
 $isGet = $_SERVER['REQUEST_METHOD'] === 'GET';
 $accept = $_SERVER['HTTP_ACCEPT'] ?? '';
 $wantsJson = strpos($accept, 'application/json') !== false;
@@ -83,12 +96,17 @@ if ($providedUrl) {
         $err = curl_error($ch);
         curl_close($ch);
 
-        if (!$err && $httpCode < 400) {
+        if ($err || $httpCode >= 400) {
+            media_log("Graph API fetch failed for mid {$mid} - http: {$httpCode} - err: {$err} - resp: " . substr($response ?? '', 0, 1000));
+        } else {
             $decoded = json_decode($response, true);
             $resolvedUrl = $decoded['url'] ?? ($decoded['data'][0]['url'] ?? null);
             if ($resolvedUrl) {
                 $mediaUrl = $resolvedUrl;
                 $resolvedFromGraph = true;
+                media_log("Resolved media URL from Graph for mid {$mid}: {$mediaUrl}");
+            } else {
+                media_log("Graph returned no media URL for mid {$mid} - resp: " . substr($response ?? '', 0, 1000));
             }
         }
         // Si hubo error o no devolvió URL, seguimos usando la URL provista como fallback
@@ -99,11 +117,21 @@ if ($providedUrl) {
     $apiUrl = rtrim(getConfigFromDB('whatsapp_api_url', 'https://graph.facebook.com/v22.0/'), '/');
     $endpoint = "{$apiUrl}/{$mediaId}";
 
+    if (empty($token)) {
+        media_log("Missing whatsapp_token for Graph API request to {$endpoint}");
+        http_response_code(500);
+        header('Content-Type: application/json; charset=utf-8');
+        echo json_encode(['success' => false, 'error' => 'Missing whatsapp_token in configuration']);
+        exit;
+    }
+
+    media_log("Graph API request to {$endpoint}");
+
     $ch = curl_init();
     curl_setopt_array($ch, [
         CURLOPT_URL => $endpoint,
         CURLOPT_RETURNTRANSFER => true,
-        CURLOPT_HTTPHEADER => [ 'Authorization: Bearer ' . $token ],
+        CURLOPT_HTTPHEADER => [ 'Authorization: Bearer ' . $token, 'Accept: application/json' ],
         CURLOPT_TIMEOUT => 15,
     ]);
     $response = curl_exec($ch);