more debug

app/controllers/api/storage.php

@@ -987,6 +987,13 @@ App::get('/v1/storage/buckets/:bucketId/files/:fileId/preview')
         $fileSecurity = $bucket->getAttribute('fileSecurity', false);
         $validator = new Authorization(Database::PERMISSION_READ);
         $valid = $validator->isValid($bucket->getRead());
+        
+        Console::info("File security: " . ($fileSecurity ? "true" : "false"));
+        Console::info("File valid: " . ($valid ? "true" : "false"));
+        Console::info("File token: " . ($isToken ? "true" : "false"));
+        Console::info("Bucket read permissions: " . json_encode($bucket->getRead()));
+        Console::info("Current authorization roles: " . json_encode(Authorization::getRoles()));
+
         if (!$fileSecurity && !$valid && !$isToken) {
             throw new Exception(Exception::USER_UNAUTHORIZED);
         }