diff --git a/admin/DashboardController.php b/admin/DashboardController.php
index 25bbcf1..4c4a9d6 100644
--- a/admin/DashboardController.php
+++ b/admin/DashboardController.php
@@ -2007,13 +2007,22 @@ HTML;
 
         if ($err) { echo json_encode(['ok' => false, 'error' => 'cURL: ' . $err]); exit; }
 
-        $decoded = json_decode($resp, true);
-        $preview = is_array($decoded) ? $decoded : (string)$resp;
+        $isBinary = !empty($contentType) && !str_contains($contentType, 'json') && !str_contains($contentType, 'text');
+        $decoded  = !$isBinary ? json_decode($resp, true) : null;
+
+        if ($isBinary) {
+            $preview = sprintf('Archivo recibido: %s — %s KB', explode(';', $contentType)[0], round(strlen($resp) / 1024, 1));
+        } elseif (is_array($decoded)) {
+            $preview = $decoded;
+        } else {
+            $preview = mb_convert_encoding(substr((string)$resp, 0, 500), 'UTF-8', 'UTF-8');
+        }
 
         // Guardar última respuesta
         if ($key !== '') {
+            $logVal = $isBinary ? "binary:{$contentType}:" . strlen($resp) . 'B' : substr((string)$resp, 0, 2000);
             db()->prepare("UPDATE company_endpoints SET last_response=?, last_called_at=NOW() WHERE company_id=? AND endpoint_key=?")
-                ->execute([is_string($resp) ? substr($resp, 0, 2000) : '', $companyId, $key]);
+                ->execute([$logVal, $companyId, $key]);
         }
 
         if ($httpCode >= 200 && $httpCode < 300) {