Placeholders are different from services we have direct support for. (In earlier versions of our app, the “Placeholder” option was labeled “Other”.) They’re a way to manually keep track of packages from other services, so you can have all your shipments in one place. If you enter a date then Deliveries will count down to that delivery date for you. If you enter a web site, you’ll be able to tap “View Online” to open the web site and manually check the status.