public FormStateInterface::setHasFileElement($has_file_element = TRUE)
Sets that this form has a file element.
bool $has_file_element: Whether this form has a file element.
$this
public function setHasFileElement($has_file_element = TRUE);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::setHasFileElement/8.1.x