If it is just a section within a page, then I would try this:
- Add a long blank section inbetween (the horizontally scrolling content will go here). It has to be long enough to cover the entire horizontal part.
- Add the content you want to go horizontally.
- Pin it to the page (it can also be done without pinning it but it far more complicated).
- Animate it with scrolling animation and move
- For me, adjusting the offset (delay) was key.
I asked about this and the support people were kind enough to share this cool tutorial with me.