What is the hook to add featured images?

First of all, your update completely, and I mean completely trashed our site. We are so incredibly at your lack of consideration and our loss of at least 50 man hours that went into setting up our directory that we looked into calling in the lawyers. And from what we can tell, the benefits are few to none.

Moving on.

We have been able to figure out the hooks to retrieve post information and to update information for all but one critical area – the featured image.

The action which works on a normal WP post has no effect on your custom post type. I have enclosed the code which works on a normal post here.
Can you please direct us in the right direction to allow the attachment of a featured image to your listings post type.

// Add Featured Image to Post
$image_url = $featured_image; // Define the image URL here
$image_name = ‘compressor.jpg’;
$upload_dir = wp_upload_dir(); // Set upload folder
$image_data = file_get_contents($image_url); // Get image data
$unique_file_name = wp_unique_filename( $upload_dir[‘path’], $image_name ); // Generate unique name
$filename = basename( $unique_file_name ); // Create image file name

// Check folder permission and define file location
if( wp_mkdir_p( $upload_dir[‘path’] ) ) {
$file = $upload_dir[‘path’] . ‘/’ . $filename;
} else {
$file = $upload_dir[‘basedir’] . ‘/’ . $filename;
}

// Create the image file on the server
file_put_contents( $file, $image_data );

// Check image file type
$wp_filetype = wp_check_filetype( $filename, null );

// Set attachment data
$attachment = array(
‘post_mime_type’ => $wp_filetype[‘type’],
‘post_title’ => sanitize_file_name( $filename ),
‘post_content’ => ”,
‘post_status’ => ‘inherit’
);

// Create the attachment
$attach_id = wp_insert_attachment( $attachment, $file, $post_id );

// Include image.php
require_once(ABSPATH . ‘wp-admin/includes/image.php’);

// Define attachment metadata
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );

// Assign metadata to attachment
wp_update_attachment_metadata( $attach_id, $attach_data );

// And finally assign featured image to post
set_post_thumbnail( $post_id, $attach_id );
// Otherwise, we’ll stop
} else {

// Arbitrarily use -2 to indicate that the page with the title already exists
$post_id = -2;

} // end if
do_action( ‘save_post’, $post_id, $post_type, true );