Lionel K. It sort of depends on how accurate you want your sitemap and wireframes in Relume to be - in my process, I get approval of the sitemap before moving into wireframes, and I get approval of wireframes before moving into design. Once approved, I generally don't go back if any updates needed to be made - I tend to keep things moving forward in my process. So in my personal process..if wireframes are approved and I need to add a page, I add it directly in Webflow. Keeping what was "approved" as a snapshot basically in Relume.
But if you wanted to document the change within Relume, I think that would make sense too.
But updating in Relume means you'll have to import said page into Webflow, which in my eyes right now, is just extra work.