Accessing Nextcloud via Zerotier on TrueNAS Scale

The main issue is veined in inability to access the nextcloud, although I’m able to access the server from my iphone, I cannot access the nextcloud. The main idea was to make a remote access to my home cloud, but I just cannot use tailscale and not a great IT specialist (for my education is a lawyer and I am as smart at all these issues, connected with the internet as a kid sometimes).

Still I managed to make a network and install nextcloud correctly, so i can get access to it from my Iphone at home and from my computer!

I will be very grateful if anybody could explain step-by-step how and what to do with all this things for I have no idea after searching for the answer a month everywhere: youtube, forums here and there, reddit and so on and so forth…

You likely have something set up incorrectly in Zeroteir. I use tailscale and Nextcloud works seemlessly with it. I am unclear as to why you cannot use tailscale, but in any event it should work with Zeroteir. Since we have no idea how you set up your system/nextcloud/zeroteir, there is no easy tutorial to point yourself at. My guess is if you can get to the system but not the Nextcloud instance, you have something misconfigured in your networking on Truenas, but it just worked for me…