This is a way to create a long vertical modal that allows you to scroll within the Modal.
Select Modal base
Set the Modal base height to 100%
3. Align the elements into vertical order by selecting "flex-start"
4. For Modal base overflow, select "Scroll"
With the above settings, you will be able to scroll the modal.
You can check the movement of the modal by linking it on the page.
It's easy if you expand the page so you can edit out the parts that sticks out.