Its very simple to attach image from any external url to post by code.
Here is the simple code that will attach image to your post.
set_time_limit(300); require_once(ABSPATH . 'wp-admin/includes/file.php'); require_once(ABSPATH . 'wp-admin/includes/media.php'); require_once(ABSPATH . 'wp-admin/includes/image.php'); $upload = media_sideload_image('IMAGE_URL', "POST_ID", "IMAGE_DESC"); die ( $upload );
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