1. Network problem: Please make sure your network connection is normal and try to download the file again. If you use campus network or company network, there may be some restrictions. You can consult your network administrator or IT department for help.
2. Server problem: Sometimes, the server that downloads files may fail or be overloaded, which makes it impossible to download files normally. You can try downloading again at a different time, or contact the file provider to confirm whether there is a server problem.
3. Incompatible file format: Please check whether the file you downloaded is compatible with your device and software. Some files may require special software to open or run. You can try to download it and open it with different software or devices.
4. File permissions: Some educational files may have permissions, and only specific users can download and view them. Please make sure that you are logged into the correct account and have the required file access rights.
If you have confirmed the above problems and still can't solve the download problem, I suggest you contact the technical support department of the school or the provider of educational documents to seek further solutions.