MC1182707 — New Copilot button in file previewer for OneDrive and SharePoint

A new Copilot button will appear in the bottom-right corner of the OneDrive and SharePoint file previewer, replacing the command bar button. It provides access to Copilot chat and contextual prompts for paid Copilot license users. Rollout begins mid-November 2025, excluding GCC, GCCH, and DoD customers.