Does anybody know how to add another contact to a group mms message after you've confirmed the initial list of contacts? For the life of me, I can't find that option. I had to start over after leaving someone out.
I believe you click the 3 dot icon on the top right.. Click people & options..then it should show the contacts in the group message and the option to add someone else
I believe that is because you are using hangouts for SMS. I just turned on SMS (via hangouts) and I do not have the add option. I think it is the same way when you are using normal messaging as well, once you start a sms thread with someone (on hangouts sms or messaging) you cannot add nor take someone out of the conversation.