Hello Brennan,
In case if you to use full URL of the image, you can just use the image name in csv and the image will read from the following location.
$attachment_file = trailingslashit( $upload_dir[‘basedir’] ) . ‘product_images/’ . $url;
Your all images should be there in the folder ‘product_images’ under your WordPress upload directory.
We are already handling this in our plugin.
Please write us back HERE if you have any queries.
We will help you.