If the email you're copying isn't immediately transferring over into the current editor at this point, then it might've been originally constructed from a template that hasn't been made compatible yet. If that's case, you'll likely need to recreate it, or put in a request with our phone support team / work with them live on a recreation.
For an overview of how the CPE works, I'd advise perusing this article, which will include links to more specific step-by-step instructions for creation, updated features, etc.
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