[AC Question]

the original text thread is not a group thread

[aximtreo]

Can you forward the original text to the new person? That might be easiest way to do what you want to do.

[scalliso]

that doesn't really answer the question, forwarding is not adding a recipient to an existing non group text message. It's a different action

[scalliso]

I don't have the answer either....

[Rukbat]

In the stock Messaging app, Menu/Add recipients.