I don't see the option to add the standard USPS, UPS and FedEx Shipping plugins when I add a new method.
![enter image description here](https://i.stack.imgur.com/LTi1d.png)

The extension is enabled and the settings already in place. But {field:shipping\_method} produces an empty drop-down on my checkout template 

![enter image description here](https://i.stack.imgur.com/eqPa2.png)