There is no upload button in chatgpt-4o

I have a free account, I use chatGPT- 4o, but there is no upload button in chatgpt-4o,I tried to change my browser, change my account, it dosen’t work! Please help me, thanks a lot!!!

The same thing is happening here. On the day the 4o was released, the option appeared normally, but after about 3 days of use, the option disappeared and hasn’t appeared again. :sob: