Saving SMS Contacts and Group Texting

Hello, and thank you for any suggestions offered. 

I am trying to save SMS contacts but it does not seam to let me save them, it will not let me save them as an Outlook contact either, which I assume ads to an external outlook account. My Zoom account is connected to my Microsoft Exchange Server.

I am also wondering if we can set up a group text including numbers outside of our network (not zoom chat), once the contacts have been created?

Thanks for the help,

Josh