Wish to ask, did deco series router support NAS Storage directly to the main deco? As suggested from tp-link post, I understand that using router that come with USB port can just plug it an external hard drive, with simple configuration it will enable NAS on the router. 

Wish to ask is there similar feature / functionality on the Deco X50-5G device? Since there isn't USB port, can I plug in a Ethernet to Hard Disk or Ethernet to USB to reach similar goals?

The ultimate goal is to use Deco X50-5G as NAS Storage with Hard Disk plugged in with adapters, is it possible?