luos/workflow/engine/methods/processes/processes_doUpload.php

<?php

use ProcessMaker\Validation\ValidationUploadedFiles;

sleep(1);
global $RBAC;
if ($RBAC->userCanAccess('PM_FACTORY') == 1) {
    if (isset($_SESSION['processes_upload'])) {
        $form = $_SESSION['processes_upload'];
        $app = new Processes();
        if (!$app->processExists($form['PRO_UID'])) {
            $result = 0;
            $msg = G::LoadTranslation('ID_PROCESS_UID_NOT_DEFINED');
            echo "{'result': $result, 'msg':'$msg'}";
            die;
        }
        switch ($form['MAIN_DIRECTORY']) {
            case 'mailTemplates':
                $sDirectory = PATH_DATA_MAILTEMPLATES . $form['PRO_UID'] . PATH_SEP . ($form['CURRENT_DIRECTORY'] != '' ? $form['CURRENT_DIRECTORY'] . PATH_SEP : '');
                break;
            case 'public':
                $sDirectory = PATH_DATA_PUBLIC . $form['PRO_UID'] . PATH_SEP . ($form['CURRENT_DIRECTORY'] != '' ? $form['CURRENT_DIRECTORY'] . PATH_SEP : '');
                break;
            default:
                die();
                break;
        }
    }

    ValidationUploadedFiles::getValidationUploadedFiles()->dispatch(function($validator) {
        $response = [
            'result' => 0,
            'msg' => $validator->getMessage()
        ];
        print_r(G::json_encode($response));
        die();
    });

    $fileName = $_FILES['form']['name'];
    if ($_FILES['form']['error'] == "0") {
        G::uploadFile($_FILES['form']['tmp_name'], $sDirectory, $fileName);
        $msg = "Uploaded (" . (round((filesize($sDirectory . $fileName) / 1024) * 10) / 10) . " kb)";
        $result = 1;
    } else {
        $msg = "Failed";
        $result = 0;
    }
    echo "{'result': $result, 'msg':'$msg'}";
}