The native Exposure features to offer stories in multiple languages are not yet complete, but there is a workaround that can work in the meantime.
To see the workaround in action please visit this story: https://usaidgreeningpreylang.exposure.co/meet-saminbsp.
You can see at the top of the story there is a button to visit a second language but only one story appears on their site https://usaidgreeningpreylang.exposure.co/.
Steps to replicate this workaround
Create and publish a story in your main language.
Duplicate that story and rewrite it in the second language.
After you publish open the story options and select "Hide story", this will hide the story from your Exposure site.
Do the following steps for as many languages as you like.
Re-visit your English story, create a Text group at the top of your story and add buttons to read the story in the other languages. Here is how.
Once done you can Ctrl+A to select the buttons, copy them and paste them into Text groups in the other language stories.