Good Technical Support

Helped me resolve “file is too big error. It exceeds: 300kB” error. Here is the fix if anyone needs it.

add_filter('uwp_get_max_upload_size', 'uwp_get_max_upload_size_cb', 10, 2);
function uwp_get_max_upload_size_cb($max_upload_size, $form_type){
    if('register' == $form_type || 'account' == $form_type ){
        return 15000000;
    }

    return $max_upload_size;
}