--- a/src/Symfony/Component/Form/Util/FormUtil.php+++ b/src/Symfony/Component/Form/Util/FormUtil.php@@ -47,8 +47,12 @@ public static function isEmpty(mixed $data): bool     public static function mergeParamsAndFiles(array $params, array $files): array     {         if (array_is_list($files)) {-            foreach ($files as $value) {-                $params[] = $value;+            foreach ($files as $key => $value) {+                if (is_array($params[$key])) {+                    $params[$key] = array_merge($params[$key], $value);+                } else {+                    $params[] = $value;+                }             }              return $params;@@ -61,6 +65,6 @@ public static function mergeParamsAndFiles(array $params, array $files): array             }         }-        return array_replace($params, $files);+        return array_merge($params, $files);     }```</details>