I have no experience with this app in particular, but most of the time there is an issue like this that you can’t reach an app or any other path besides the index, is because the app itself doesn’t work well with path redirection of subfolders, meaning the app expects paths to be something like domain.tld/index.html instead of domain.tld/subfolder/index.html for all its routes.

Some apps let you add a prefix to all its routes they can work, so you not only have to configure nginx but the app itself to work with the same subfolder.

Other apps will work with the right configuration in nginx if they do a new full page load every time the page changes its path/route.

If it is a PWA that doesn’t do a page load every time the path is changed, it’s not going to work with subfolders as they don’t do any page refresh that goes through nginx, and just rewrite the visible URL on the browser

What I can recommend is to switch to a subdomain like 2fa.domain.tld instead of a subfolder and test if it works, as subdomains are the modern standard for this kind of thing these days, to avoid this type of issues.

Edit: looking at the app demo, it seems to be a vue.js PWA that doesn’t do any full page refreshes on a path change, so as stated you will probably have to switch to a subdomain to make it work.

As others have already commented, what you need is a Dynamic DNS service, where you register a subdomain, and setup a small program or script on your computer that pings the DDNS server every few minutes, that way you leave that running on the background, and if the program detects that the IP with the request changes, it will update the subdomain to point to it automatically.

You could access the blog from the subdomain of the DDNS directly or if you get your own domain, you can point it to the DDNS.

If you want a recommendation, I have been using DuckDNS for years, and it has been pretty reliable.

Used Gitea for a while, and decided to switch to Forgejo before the hard fork split (no more code from Gitea), been using it since, In my opinion both work well, but prefer Forgejo.

Having the ability to shut down the main instance of an app and run a secondary instance from backups without much hassle is the best feeling ever, I recently updated from Nextcloud v26 to v31, and having the ability to just go back to a working version if anything was wrong saved me from so much stress.

Yeah, these are pretty solid advice, would say that you should be safe with patch version updates, like from 1.17.1 to 1.17.4

Should be able to jump from 1.17.4 to 2.0.1 and from 2.0.1 to 2.1.3, etc. going straight to the last patch of the next version, but should go one by one minor version, paying close attention to those versions that have breaking changes in the release notes. And always backup and test before each version jump.

This probably is the issue, when you download a script or binary from the internet it doesn’t have execution permission, you would have to right click on folder to open in terminal (that way don’t have to cd to it), and check permissions with ls -la if it doesn’t have permission, change it with chmod