I’m using Wordpres 6.6.1
When we upload images through Media Library it’s created many scaled version of the image.

I have a plugin where I upload the image by own code. Here the code:

$hashed_filename = md5( $_FILES['images']['name'][$key] . microtime() ) . '_' . $_FILES['images']['name'][$key];
        
        move_uploaded_file( $_FILES["images"]["tmp_name"][$key], $upload_dir['path']."/" . $hashed_filename);
        
        $attachment = array(
            'post_mime_type' => $_FILES['images']['type'][$key],
            'post_title' => preg_replace('/.[^.]+$/', '', basename($hashed_filename)),
            'post_content' => '',
            'post_status' => 'inherit',
            'guid' => $wp_upload_dir['url'] . '/' . basename($hashed_filename)
        );
        $attach_id = wp_insert_attachment( $attachment, $upload_dir['path'] . '/' . $hashed_filename );
        
        $info = getimagesize($_FILES['images']['name'][$key]);
        $meta = array (
            'width' => $info[0],
            'height' => $info[1],
            'hwstring_small' => "height='{$info[1]}' width='{$info[0]}'",
            'file' => preg_replace('/.[^.]+$/', '', basename($hashed_filename)),
            'sizes' => array(),
            'image_meta' => array(),
        );
        update_post_meta($attach_id, '_wp_attachment_metadata', $meta);

Problem is it upload only a version with original size of the image of course. I want to create multiple scaled version as Media Library. How can I do it?

Thanks

create scaled image when upload it.