Currently, if a person is in an active Vina message, and wants to add additional people to the thread, the User selects the Plus Icon > types in the other person's/people's name(s) in the Search Bar, then they need to know to select "Search" to finalize this selection, then "Start". It is not intuitive to have to select "Search" to continue. Ideally, after selecting the additional person/people, the app should take you back to the conversation or remove the keyboard so the Start button is visible.
Erin Maruoka
Adding this as a potential future enhancement to Vina as well as future app. Further exploration will be planned in the future.