Internal links not working

As the subject says, I can’t get internal links (as explained in the docs) to work properly.

I have a file in the root of my /content/ directory, and I’m trying to link to a section index. In other words, the relevant part of the site layout is:

├── config.toml
├── content/
│   └── _index.md
│   └── otherpage.md
│   └── chapter 1/
│       └── _index.md

In otherpage.md, I tried a relative link like so: [a link](@/chapter 1/_index.md). However, it just renders the whole thing verbatim, i.e. it isn’t parsed/converted into a link.

I’ve tried it both via zola serve and with build. I’ve also tried setting base_url in the config to "/" and to the actual address it’ll be on when I’m done, but no combination of these has worked.

Any ideas on what I might be missing?