MC1423103 — Copilot Notebooks now supports Markdown (.md) files as grounding sources

Copilot Notebooks now support Markdown (.md) files as reference sources, enabling grounding in technical docs without conversion. This feature, rolling out worldwide by early August 2026, requires no admin setup, respects existing permissions, and enhances Copilot’s response relevance using Markdown content. No user action is needed.

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