Kevin, it's building the animation that is so much easier in a video timeline if you have multiple moving elements. With one moving element you can make frames with step and repeat and use Make Frames from Layers, or you can tween. It takes no time at all. But when you add a second element, it gets complicated. You have manually turn on the right layer for each frame. That's bad enough, but gets much worse when you need dissimilar movement. At this stage, the frames are the frames. You can't change that without messing up the first element, so you have to work out the relative movement between the two (or more elements) and it takes a long time and the results are nearly always a compromise. Plus, frame animations are jerky.
If you use a video timeline you can stack video groups and treat one independently of the others. It's super easy, and far less complicated. I only cottened on to this recently, and even then I didn't think of exporting the video timeline to a GIF.
It turns out that you still use Export > Save for Web, which I got from one of Conrad's posts. I am not sure I'd have thought of it otherwise. This has 150 frames, is just 150kb, and is smoother than if I did it with a frame animation timeline. Plus it loops!
Video timelines have way more options than frame animations. Something else I have been doing is render out a short clip and bring the .m,p4 back into a new timeline. This gets around some complications. I will almost certainly be using video timelines going forward.
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