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Try turning wifi off and see if it works.
I have the exact same problem on AT&T and it seems when wifi is on along with advanced messaging, the app can't connect to the RCS server to upload photos. Turn off wifi and all is fine. My wife's note 9 is doing the same.
I never use the stock messaging app on any device as there are better options out there. I've been using Textra for years on every device without issue. So far, no issues texting on ATT using Textra on the 20 Ultra.
I purchased my phone 10/3 and started using it officially 10/10. It was working fine but now it's been unable to send text messages in both Samsung app & now Google message. I've tried updating profile and prl and it still lags or has error sending messages. I just got this phone so if there is a problem I need to return it before 10/16. I'm on the Sprint/Tmobile network. Anyone knows how to get Samsung to fix this? Anyone knows how to help? Thank you.
I have started having probelms with mine 2 days ago. first it would only send text messages one by one and I couldn't send in a group anymore. and it was also converting them all into mms messages. the only way I can send a text is to one person and only typing around 2 or 3 words . anything longer and it comes up converting to mms and saying it cant send as network doesn't support it.