Dear Ron Stamm,
Good day.
Per the description you have shared, your query is related to our copilot Team. It will be best if you reach out to them so you can be assisted accurately.
Please contact them via Copilot for Microsoft 365 - Microsoft Community Hub.
after testing from my end, i am facing the same issue so, it may not be possible as Copilot is designed to provide general assistance and may not have access to specific chat histories. However, i suggest to double check with the dedicated team.
For other concerns, please do not hesitate to add you post in the Microsoft Community Team. Thank you for choosing Microsoft as your partner in business.
Sincerely
Eben | Microsoft Community Moderator