Previous Legacy editor allowed to nest UML macro inside Expand macro. 

However, the new Cloud editor does not allow.

When adding the UML macro inside the expand, it is moved outside the expand.

As workaround, the users need to create pages on the Legacy Editor, embed the UML macro inside the expand and then convert to the new Cloud editor, thus the Legacy Macro will embed the UML macro and allow the diagram to be visible inside the expand.