Scrape external webpage for first image and add it to new post

It is possible as referenced here

but you are talking about a great deal of customization in the Gravity forms plugin and like you said you are not a programmer yourself, so you better open a support ticket in their forums and they might be able to help.

Also look at this code that can help you if you decide to do it yourself

    $upload_dir = wp_upload_dir();
$image_data = file_get_contents($image_url);
$filename = basename($image_url);
if(wp_mkdir_p($upload_dir['path']))
    $file = $upload_dir['path'] . "https://wordpress.stackexchange.com/" . $filename;
else
    $file = $upload_dir['basedir'] . "https://wordpress.stackexchange.com/" . $filename;
file_put_contents($file, $image_data);

$wp_filetype = wp_check_filetype($filename, null );
$attachment = array(
    'post_mime_type' => $wp_filetype['type'],
    'post_title' => sanitize_file_name($filename),
    'post_content' => '',
    'post_status' => 'inherit'
);
$attach_id = wp_insert_attachment( $attachment, $file, $post_id );
require_once(ABSPATH . 'wp-admin/includes/image.php');
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );
wp_update_attachment_metadata( $attach_id, $attach_data );

set_post_thumbnail( $post_id, $attach_id );

$image_url is what you will get from user input / upload.

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