--- /dev/null
+/**
+ * Implements hook_file_validate().
+ */
+function {{ machine_name }}_file_validate(Drupal\file\FileInterface $file) {
+ $errors = [];
+
+ if (!$file->getFilename()) {
+ $errors[] = t("The file's name is empty. Please give a name to the file.");
+ }
+ if (strlen($file->getFilename()) > 255) {
+ $errors[] = t("The file's name exceeds the 255 characters limit. Please rename the file and try again.");
+ }
+
+ return $errors;
+}