Yes, I know about the Raspberry Pi solution. But I don't need more hardware. Regarding wifi mesh, sure it's working fine. But when you pay €300+ for a system "that's sooo good" and then quite soon...

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...