--- /dev/null
+/**
+ * Implements hook_file_move().
+ */
+function {{ machine_name }}_file_move(Drupal\file\FileInterface $file, Drupal\file\FileInterface $source) {
+ // Make sure that the file name starts with the owner's user name.
+ if (strpos($file->getFilename(), $file->getOwner()->name) !== 0) {
+ $file->setFilename($file->getOwner()->name . '_' . $file->getFilename());
+ $file->save();
+
+ \Drupal::logger('file')->notice('Moved file %source has been renamed to %destination', ['%source' => $source->filename, '%destination' => $file->getFilename()]);
+ }
+}