I need some advice from anyone who makes animatics— in like early 2020 I storyboarded some animatics on FlipaClip and pretty much forgot about them until today— two questions:

is there any way to add audio to them or does that app not allow it (in the free version at least), and is there any way to change the speed it runs at or would I have to put it into some video-making software to actually decide who long it stays on each frame?

and if I have to put it in a video making software, how do I get it from FlipaClip into one of those