fix #625

src/Extend/Manager.php

@@ -495,7 +495,7 @@ class Manager
         $tempDir = storage_path('tmp/'.($dir ?: time().Str::random()));
 
         if (! is_dir($tempDir)) {
-            if (! $this->files->makeDirectory($tempDir, 777, true)) {
+            if (! $this->files->makeDirectory($tempDir, 0777, true)) {
                 throw new RuntimeException(sprintf('Cannot write to directory "%s"', storage_path()));
             }
         }