Upload arquivos acentuados WordPress

functions.php

<?php
// https://wordpress.org/support/topic/uploaded-image-with-accents-in-name-image-dont-show-in-safari-6
  function sanitize_filename_on_upload($filename) {
    $ext = end(explode('.', $filename));
    // Replace all weird characters
    $sanitized = preg_replace('/[^a-zA-Z0-9-_.]/', '', substr($filename, 0, -(strlen($ext)+1)));
    // Replace dots inside filename
    $sanitized = str_replace('.', '-', $sanitized);
    return strtolower($sanitized.'.'.$ext);
  }
  add_filter('sanitize_file_name', 'sanitize_filename_on_upload', 10);