Can't Add Character Styles in XD

Hi, I am using Adobe XD 57.1.12.2 . I created a character style from Segoe UI font. But I can't create another character style from a text box . Even in the right click the "Add Character Style to assets" doesn't appear.  It is only showing in the first text box I created. I tried to again add a character style from the first text box and edit it in the Character Styles section , but it also edits the first Character Style.

On the Second Text Box , instead of "Add Character Style to Assets" , it shows "Reveal Character Style in Assets" .

Kindly Help.