My Drive will not connect to new router

I have a WD My Drive NAS drive that has been working like a champ. Just upgraded my router from a Nighthawk | Dual Band WiFi Router | AC1900 to a Tp link Archer C5400X triband. Plugged in ethernet and power, but My Drive does NOT SHOW up a device on this router. HELP! How do I find my NAS and access my files???
Many thanks for any help!