I would like to add an external USB hard drive to our Deco M9 Plus mesh. The intention is to have it work as a network drive for the family. You know, photos, documents and stuff. Please advice how this can be done without buying more hardware (we already have the hard drive).

(I understand this has been addressed before and that it cannot be done. But thought it would be nice to get to the firm acknowledgement that the investment in the TP Link mesh was money down the drain.)