It may be caused by the following situations: 1. Browsers, because of the compatibility identification problem of different browsers, sometimes reopening the browser will be successful, which can be solved by replacing the browser and restarting the browser; 2. There are three kinds of picture problems. First, the original size does not meet the requirements. Second, there is something wrong with the picture format. Third, the size is correct for the format, but the file is too large (usually the resolution). It can be solved by modifying the format, size and resolution of the picture. I hope the answer of Zhisheng Intellectual Property will help your question.