Hi, I have seen that when I try to read upwork message on iphone or mac then its blinking and I couldn't read the message or I coldn't send the message.
I'm not sure what you mean when you say blinking. Do you have screen grabs of the issue you're experiencing? Please make sure to black out any private information such as names, and chat/conversation if you will be posting any screen grab.
Alternatively, you can also send me a private message so that I can look into this further.
Would you mind clarifying exactly what happens so I can better assist you? Do you get any relevant error messages? You can also try clearing the cache and cookies of the browser you are using and see if that helps.