generate an interactive image dock with image upload and download functions

function create_image_post($data, $upload_image_data) {
  // upload image
  $image_id = wp_insert_attachment($upload_image_data);
  update_post_meta($image_id, 'image_upload', $upload_image_data);
  // create post
  $post_id = wp_insert_post($data);
  // attach image to post
  set_post_thumbnail($post_id, $image_id);
  return $post_id;
}
$upload_image_data = [
  'guid' => $upload_dir['url'] . '/' . basename($filename),
  'post_mime_type' => $wp_filetype['type'],
  'post_title' => preg_replace('/\.[^.]+$/', '', basename($filename)),
  'post_content' => '',
  'post_status' => 'inherit',
  'post_date' => date('Y-m-d H:i:s'),