In this article, I'll show you how to add Twig Template Suggestions for file managed in drupal 8.
/**
* @param array $suggestions
* @param array $variables
* @param $hook
*/
function THEMENAME_theme_suggestions_file_managed_file_alter(array &$suggestions, array $variables, $hook)
{
if (isset($variables['element']['#id'])) {
$id = str_replace("-", "_", $variables['element']['#id']);
$suggestions[] = $hook . '__' . $id;
}
}
