How to add Woocommerce Product Gallery using Gravity Forms - php

Question

I am trying to add WooCommerce Product Gallery using Gravity forms multiple file upload but product gallery should not be added
add_action( 'gform_after_submission_3', 'set_post_content', 10, 2 );
function set_post_content( $entry, $form ) {
if (!function_exists('wp_generate_attachment_metadata')) {
require_once(ABSPATH . 'wp-admin/includes/image.php');
}
$uploaded_files = json_decode(rgpost("gform_uploaded_files"));
foreach($uploaded_files->input_76 as $key => $data){
if (isset($_FILES[$data])) {
$file_url = $data->input_76; //great but what is its url?
$upload_dir = wp_upload_dir(); //where do you want to put it?
$file_data = file_get_contents($file_url); //show me what you're made of
$filename = basename($file_url); //so cute but what's its name?
if (wp_mkdir_p($upload_dir['path'])) //can we put it there?
$file = $upload_dir['path'] . '/' . $filename; //yes great
else //or no, okay fine let's try somewhere else
$file = $upload_dir['basedir'] . '/' . $filename; //get the whole location
file_put_contents($file, $file_data); // tada home at last
//$wp_filetype = wp_check_filetype($filename, array('pdf' => 'application/pdf','pdf' => 'application/x-pdf') ); //is it the right type of of file?
$attachment = array(//set up the attachment
//'post_mime_type' => $wp_filetype['type'],
'post_title' => sanitize_file_name($filename),
'post_content' => '',
'post_status' => 'inherit'
);
$attach_id = wp_insert_attachment($attachment, $file, $entry['post_id']); //insert attachment
$attach_data = wp_generate_attachment_metadata($attach_id, $file); //asign the meta
wp_update_attachment_metadata($attach_id, $attach_data); //update the post
update_post_meta($entry['post_id'], '_product_image_gallery', $attach_id);
}
}
}