How this works: saved changes are stored in a real backend (Netlify Blobs), not a file you have to re-upload. Only someone logged in with an invited Tessori admin account can publish changes — this is enforced by Netlify's servers, not just hidden in the page, so it can't be bypassed by viewing source or editing the page. "Preview draft" saves a personal, unpublished copy to this browser only, useful for trying changes before they go live.