How to apply automatically a sensitivity label from clipboard?

Hello. I have rolled out Microsoft 365 Copilot to a early adopter group and I have activated sensitivity labels with Microsoft purview. Users report that If they summarize a document with Microsoft Copilot that is labeled as confidential and copy that text into an email, the label confidential does not apply to the email - label stays general. I am concerned of a data loss risk. what do I need to configure in Microsoft purview to prevent this behavior? It seems like an auto-labeling policy does not resolve this issue.