Unable to Reply to Group Text of More than 10 People on RingCentral App

As per this following link

https://community.ringcentral.com/questions/29772/adding-recipients-from-excel-for-sms-creating-grou.html

"You can send an SMS individually or group in up to 10 numbers outside of your contact list by separating it by a semicolon. "

I can also see a feature request in idea portal on same

https://ideas.ringcentral.com/ideas/CUSTCOM-I-1158

Thank you for your reply; however, that only works if I am sending a text. In this case, I'm replying to a group text sent by my colleague and I am unable to edit any names in the group including adding semicolons or simply removing them. Unfortunately feature requests are great, but don't happen for months or years with RC. Thanks again for your reply.