Hypertext links not working when in a scroll box

For the sake of closure, here's what I learned (much thanks to the Support team!): The Send email trigger will only allow you to select objects like the Textbox (scrolling or fixed) or a button/shape/image, but will not allow you to select specific texts within the Textbox. This is expected behavior. If you need to select specific texts in the textbox, you can add a hyperlink, that uses the "Open URL/File" with a "mailto:" trigger.