The laptop is connected to the WiFi network, so it can only download things, but the files can't be sent out. No matter using QQ or WeChat, the files can't be sent out.
Two reasons, 1. Your own network is unstable, which makes it impossible to answer your access request correctly; 2. The target server you visited is unstable and cannot respond to your access request correctly. That is to say, when Han Dan blocked Phoenix, you couldn't access the port you want to connect to in Fujiang because you didn't publish an effective web service.