Currently the versions of a page do not reflect the included version of attachments in the page. When looking at older version of a page, attachment are always referenced as latest version.
When including or linking an attachment in a page the version of the attachment should be referenced in the page. As soon as a newer version of an attachment is added, the version of the page should also reflect this.
This enables workflows to easily work for attachment approvals. It might also help enterprise customers to move from classic document-management (e.g. Sharepoint) to a compliant web-based document-control, not only referring an approved office document within a page, but the complete confluence page as compliant document.