How do you save a lesson offline on Android?

From within a course, if I hit the three dots next to a lesson, I can hit “Save”. Yet, nothing seems to happen. No visual confirmation of any kind. When I later switch my internet connection off, I can’t access the lesson. Maybe I am doing something wrong?

The course in question is a really long epub (LingQ split it into about 500 lessons, I believe), in case that’s relevant. But I am not trying to save the whole course, just individual lessons (though the whole course would be pretty useful too)

What you can do offline is to read and listen lessons you loaded while you were online. All the lessons you loaded earlier will be available later for normal use in offline mode too. Saving lessons, for now, doesn’t work in offline mode.