The context does not provide any supported method to recover or export an individual Copilot Chat transcript when it no longer loads in the browser, nor any troubleshooting steps specific to stuck or oversized chats. It only documents where Copilot Chat can be accessed and how it is managed or controlled.
References:
- Overview of Microsoft 365 Copilot Chat
- Frequently asked questions about Copilot Chat
- Microsoft 365 Copilot Chat
- How Copilot Chat works with and without a Microsoft 365 Copilot license
- Manage Microsoft 365 Copilot Chat
- Copilot Chat in Edge
- Outlook_appchat
- Unable to log into m365.cloud.microsoft, something went wrong - Microsoft Q&A