Can I add sound? – FlipaClip: Create 2D Animation Review

I like the app, I remember using it years ago before, but one thing I’d like to know is if sound can be added to the videos, because I currently can’t/don’t know how to. If not then could you perhaps add a feature that allows you to put sound in animations?
Review by Xchell on FlipaClip: Create 2D Animation.