Get User’s Facebook Photos as WordPress Upload
You can use media_sideload_image() which will take a link to a file and upload it to the media library. You do need to pass it some kind of $post_id @Sumit points out in the comments you could pass NULL into the $post_id field. media_sideload_image( $file_url, $post_id, $image_desc, $return ); If you need the uploaded image … Read more