I imagine you are using k8s because you want to learn the platform.
In a real cluster with multiple machines, you don’t know which machine will run your container (that’s the point of clusters).
Do you need to host your files on a storage server and link these files to the containers through nfs.
See this post for an example on his to do it.
You need to get a subdomain. It should be two words separated by a hyphen. Then you use that as the address.
If your address is glossy-mouse, the address will be glossy-mouse.mytailnet.ts.net.