Hey folks 
Thanks for sharing your ideas around sharing specific parts of a document. I understand that designers won’t always want to share an entire document with others, especially when you want their feedback scoped to a specific page or set of pages.
Sharing remains a big focus of the web team, and we continue to investigate new and improved ways of sharing design work and prototypes with people both inside and outside of your Workspaces.
The feedback in this thread, and the one @raulrincon shared above is really insightful, myself and the rest of the web team are following both 