Edit/Provide Feedback on HTML Emails in Asana

Presently, we understand there is no way to edit/provide feedback for a HTML-designed email in Asana. We are able to get feedback on all other projects thusfar but emails. Please develop a means by which HTML emails can be reviewed so a version can be downloaded and saved to the parent project or task for stakeholder review. We use Mailchimp, for example, send as a test and forward this to the group as edits presently. We can attach as a .pdf in Asana but there are no live links for full review of the file. Please update and provide a solution to streamline email review processes for clients. Thanks!