The reason why the file sent by the computer can't be opened on WeChat may be that the file format is wrong. It is recommended to follow the instructions of WeChat, install the corresponding software and then open it.

The file is too big, and the phone memory is not enough. At this time, you can choose to clean up the phone memory to solve the problem. You can download WPS, Microsoft office and other applications on your mobile phone, which can help you open files in most formats.