How do I learn

…you say in your OP. Yet instead of learning, you complain “what kind of crap server is that”. You don’t learn by thinking anything is the softwares fault.

It is perfecthy normal, that you can reach the server IN your home network only when you are connected TO your home network. That is a security feature by your router and thus by design. But in order to learn how to open it up, you would need to be willing to learn.

But for the beginning: how is that even bad or crap? Like, it saves your photos when you come home and connect to wifi. Awesome, congrats!