Does sound work in Synfig?

I am running 1.4.0 of Synfig which has a speaker icon near the timeline and allows me to attach a .flac file to my animation. Visually, this Synfig feature seems to work fine. However, when I render, my mp4 or avi have no sound. When I search this forum about it, I see a lot of replies stating that Synfig does not support audio. However, these replies are many years old, and Iā€™m not sure they still apply. Should the sound feature work? Or is it 90% complete, but without the final piece of the puzzle in place?

https://forums.synfig.org/latest -> 12d ago :wink:
Rendered Video No Sound