I do not have much experience with animation and was struggling to get a simple animation done in WeWeb. While researching the terms, styles, etc. I found this free site, which was very helpful:
After you build your animation, at the top right of the little studio window there is a bracket icon {*} that will allow you to export the keyframes.
Which you can then import directly into weweb’s keyframe editor:
Note: you must click the “Keyframes” button inside the editor, above timeline (between “Percent” and “Play” elements) to reveal the place you paste this code.
I read the WeWeb docs and watched the animation video a couple times, but still found/find implementing animations less than intuitive. The 3rd party tool helps with that a bit.