Debug

config/current.ver

@@ -1 +1 @@
-1.2.15
+1.2.16

src/ApiKernel.php

@@ -4917,6 +4917,17 @@ SQL;
         $file = rtrim($dir, '/') . '/' . $safeName . '.log';
         $data = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
         @file_put_contents($file, $data ?: '');
+
+        $fallback = sys_get_temp_dir() . '/emailtemplate_debug.log';
+        $line = json_encode([
+            'time' => date(DATE_ATOM),
+            'name' => $safeName,
+            'file' => $file,
+            'wrote_bytes' => is_string($data) ? strlen($data) : 0,
+            'dir_exists' => is_dir($dir),
+            'dir_writable' => is_writable($dir),
+        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        @file_put_contents($fallback, ($line ?: '') . "\n", FILE_APPEND);
     }
 
     private function defaultApiBase(): string