我正在尝试从前端上传特色图像，我的id也会插入post\\u meta，但图像不会上传到媒体库

https://www.screencast.com/t/Uakjtxi9ojv

Here is my code.

            $uploaddir = wp_upload_dir();
            $file = $_FILES[\'cptFeatured\'];

            $uploadfile = $uploaddir[\'path\'] . \'/\' . basename( $file[\'name\'] );

            move_uploaded_file( $file["tmp_name"] , $uploadfile );
            $filename = basename( $uploadfile );

            $wp_filetype = wp_check_filetype(basename($filename[\'name\']), null );

            $attachment = array(
                \'post_mime_type\' => $wp_filetype[\'type\'],
                \'post_title\' => preg_replace(\'/\\.[^.]+$/\', \'\', $filename),
                \'post_content\' => \'\',
                \'post_status\' => \'inherit\',
                \'menu_order\' => $_i + 1000
            );


            $attach_id = wp_insert_attachment( $attachment, $uploadfile, $cpt_id );

            update_post_meta($cpt_id, \'_thumbnail_id\', $attach_id);
            set_post_thumbnail( $cpt_id, $attach_id );