They have fixed the app so that you can now type in new, multiple addresses from your laptop!! I just discovered it in the last few days! Thank you!
Greetings - I am using a Surface Pro running Windows 10 and "Your Phone" version 1.20082.141.0 (latest from Microsoft Store. The app still does not appear to allow multiple selections from the contact list, instead as you type in a name and then select it, the program immediately begins (or continues) a text thread with the one individual contact. Are you saying you are able to type in multiple contact names? Could you explain the steps you are taking to have it send a group text? Thank you for elaborating and clarifying!