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When fileVisibility returns OK → download server-side (fast). When not available → HTTP 302 redirect to eTerra direct URL. User's browser session handles authentication automatically. This means: if logged into eTerra in browser, ALL documents download. If not logged in, eTerra shows its own login page. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>