upload box remove

add_filter('wplms_course_creation_tabs',function($tabs){
    $curriculum_elements = $tabs['course_curriculum']['fields'][0]['curriculum_elements'];
    foreach ($curriculum_elements as $key => $curriculum_element) {
        if($curriculum_element['type'] == 'assignment'){
            foreach ($curriculum_element['types'] as $key1 => $type) {
                if($type['id'] == 'textarea'){
                    $curriculum_element['types'][$key1]['icon'] = 'vicon vicon-text'; //your icon ti will be replace by vicon from https://themify.me/themify-icons
                }elseif($type['id'] == 'upload'){
                    unset($curriculum_element['types'][$key1]);
                }
            }
            $curriculum_elements[$key] = $curriculum_element;       
        }
    }
    $tabs['course_curriculum']['fields'][0]['curriculum_elements'] = $curriculum_elements;
    return $tabs;
},10,1);