Mathjax `\ref` does not work with Apex

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The wave function $\psi(x,t)$ is solution of the Schrödinger equation 

$$i\hbar\frac{\partial\psi}{\partial t}=\underbrace{\frac{1}{2m}\Delta\psi}_{\text{kinetic}}+V(x) \label{schroedinger}$$

but more importantly $\left|\psi(x,t)\right|^2$ is the density of probability of presence of the particle at the position $x$ at the time $t$. Let’s try to refer to eqn. (\ref{schroedinger}).

gives eqn. (???) where the question marks are an anchor with href="file:path-to-the-folder-containing-the-markdown-file/?mknav=BD0F0459-442A-497B-91AA-2D3144558A15#"

I attached the setting file saved by Marked.

[MarkedConfig.zip]
(https://support.markedapp.com/uploads/files/post/5TbBVyobzcN/MarkedConfig.zip)

2 Answers

You have to enable "Number equations" in Settings->Style for \ref to work.

It does not work with Kramdown either actually…