Markdown standard links.
On any markdown editor links to files are like this:
[link sample][relative_path.sample
Say I have .md files pointing to other files in my next cloud archive, with any markdown app on my pic I can click the links and they will take me to the file, with this markdown editor instead links does not work at all. I have to manually insert a link to a file trough the button on the editor, in that case links work... but they do not work on any other markdown editor because they are no longer standard markdown links but they're different and include other informations.
this basically makes this markdown editor basically useless, it produces .md files with links that no other app/site can understand.
Duplicate of https://github.com/nextcloud/text/issues/2136 and https://github.com/nextcloud/text/issues/2774.
@ironhak relative links should work. If you want to have a collection of markdown files referencing to each other, maybe the Collectives app is a better fit for you? It uses Nextcloud Text as editor, but has a UI built around it to organize pages and subpages in a list. It allows to drag & drop other pages into the editor to link to them and has support for relative links as well (e.g. when added by another offline markdown editor).