Maybe a silly question, but i don"'t see how can i solve the problem:
I have a MacBook Pro, a Windows laptop and an iPhone i want to sync with my private NextCloud server at home in my home-network behind a Huawei 4G Router. I can reach my NextCloud server from outside by a No-Ip domainname and portforwarding in the Huawei. When i am outside my home, i connect via 4G internet or via the internet at the place i am working.
When i am at home, i want to connect to my NextCloud server on my private home-network because the use of my Huawei 4G router costs money: “Unlimited Internet” in terms of T-Mobile is in practice “100GB /month, 5GB/day”.
How can i connect transparently to my NextCloud server when i am at home and when i am outside? I am not an expert.