Function.php not working (Required upload files and Checkbox fields)

I am adding special custom fields such as Upload file (Instructors CV) and a checkbox to accept terms and conditions in the instructor registration form.

As seen in the link, my html code is working:

<div class="tutor-form-col-6">
            <div class="tutor-form-group">
                <input type="checkbox" id="aceptar" name="aceptar"
         checked> <p>Hola. ?Queréis visitar el sitio web <a href="https://www.google.com">Google</a>?
         
            </div>
        </div>
        
    </div>

         <div class="tutor-form-row"> 
        <div class="tutor-form-col-6">
            <div class="tutor-form-group">
                <label for="cv_no">Selecciona un archivo con tu CV:</label>
                <input type="file" id="cv_no" name="cv_no">

            </div>
        </div>  

Now. I need help in making them work. I have these function.php files but they don’t work:

}
    add_filter('tutor_instructor_registration_required_fields', 'required_checkbox_callback');
if ( ! function_exists('required_checkbox_callback')){
    function required_checkbox_callback($atts){
        $atts['check_no'] = 'Debes aceptar el checkbox para continuar';
        return $atts;
    }
}
add_filter('tutor_instructor_registration_required_fields', 'required_cv_no_callback');
if ( ! function_exists('required_cv_no_callback')){
    function required_cv_no_callback($atts){
        $atts['cv_no'] = 'Debes Subir tu CV';
        return $atts;
    }
}
add_action('user_register', 'add_cv_after_user_register');
add_action('profile_update', 'add_cv_after_user_register');
if ( ! function_exists('add_cv_after_user_register')) {
    function add_cv_after_user_register($user_id){
       
        }

The page I need help with: [log in to see the link]