You may have troubles with file storage. It can mark your file as temporary file. And it will disappear after file cron. So it's better to consider this topic to prevent Drupal doing it.

$file->setPermanent(); $file->save(); // Add to file usage calculation. \Drupal::service('file.usage')->add($file, 'my_module_name', 'file'); 

You may have troubles with file storage. It can mark your file as temporary file. And it will disappear after file cron. So it's better to consider this topic to prevent Drupal doing it.

$file->setPermanent(); $file->save(); // Add to file usage calculation. \Drupal::service('file.usage')->add($file, 'my_module_name', 'file', $file->id());