try {
            if(empty($_FILES['uploaded_files'])){
                $files = '';
            } else {
                //Attach multiple files one by one
                for ($i = 0; $i < count($_FILES['uploaded_files']['tmp_name']); $i++) {
                    if ($i == $maximumfiles) {
                        throw new RuntimeException('<div class="alert">Sie haben zuviele Dateien hochgeladen.</div>');
                    }
                    if (!isset($_FILES['uploaded_files']['error'][$i])) {
                        throw new RuntimeException('<div class="alert">Etwas mit Ihren Dateien stimmt nicht.</div>');
                    }
                    switch ($_FILES['uploaded_files']['error'][$i]) {
                        case UPLOAD_ERR_OK:
                            break;
                        // case UPLOAD_ERR_NO_FILE:
                        //     throw new RuntimeException('<div class="alert">Eine Ihrer Dateien scheint nicht verschickt worden zu sein.</div>');
                        case UPLOAD_ERR_INI_SIZE:
                        case UPLOAD_ERR_FORM_SIZE:
                            throw new RuntimeException('<div class="alert">Eine Ihrer Dateien scheint von der Datenmenge groß zu sein.</div>');
                        // default:
                        //     throw new RuntimeException('<div class="alert">Ein unbekannter Fehler ist aufgetreten.</div>');
                    }
                    if ($_FILES['uploaded_files']['size'][$i] > 5000000) {
                        throw new RuntimeException('<div class="alert">Die maximale Dateigröße ist überschritten.</div>');
                    }

                    $extension = strtolower(pathinfo($_FILES['uploaded_files']['name'][$i], PATHINFO_EXTENSION));
                    $allowed_extensions = array('jpg', 'jpeg', 'pdf');

                    if(!in_array($extension, $allowed_extensions)) {
                        throw new RuntimeException('<div class="alert">Nicht erlaubtes Dateiformat!</div>');
                    }

                    $allowed_types = array ('application/pdf', 'image/jpeg');
                    $fileInfo = finfo_open(FILEINFO_MIME_TYPE);
                    $detected_type = finfo_file( $fileInfo, $_FILES['uploaded_files']['tmp_name'][$i] );
                    if ( !in_array($detected_type, $allowed_types) ) {
                        throw new RuntimeException('<div class="alert">Nicht erlaubtes Dateiformat!</div>');
                    }
                    finfo_close( $fileInfo );

                    $uploadfile = tempnam(sys_get_temp_dir(), hash('sha256', $_FILES['uploaded_files']['name'][$i]));
                    $filename = $_FILES['uploaded_files']['name'][$i];

                    if (move_uploaded_file($_FILES['uploaded_files']['tmp_name'][$i], $uploadfile)) {
                        $files = $mail->addAttachment($uploadfile, $filename);
                    } else {
                        $msg .= 'Failed to move file to ' . $uploadfile;
                    }
                }
            }