Hello! I am getting an error message when trying to reply to a "group text" with 7 other people. I am seeing their messages, photos, etc. But can't reply back - each response comes back with my original message in purple box with red circle (!) error code = mixed group of iPhone & Android users. I have Galaxy S7...

I have tested a separate group of friends to see if they receive my messages, and both groups are getting them. Just this other one that seems to be the challenge - not sure what's going on here!

"Couldn't send message"
-Resend
-Delete
-Edit

I have tried the 'resend' option multiple times, but 'failure' keeps happening. This is the language that shows up in the (!) box to top right of my initial message. Thanks in advance for any feedback!!