I am using my own router for FIOS internet connection. The External USB HDD connected to TP-LINK Archer C1200 is not getting detected in the TP-Link setup page. Let me know how to fix this please.
This is a router issue with TP Link not your Fios connection.
go to their support page and look up issues with hooking external hard disk drives to their routers.
https://www.tp-link.com/us/faq-253.html
https://www.tp-link.com/us/faq-420.html