1, see if the file size and format uploaded by the website are required, and then see if your own file meets the requirements.
2. Look at the upload deadline. You can't upload it after the deadline.
3. If there is no problem, you can call the website technical service personnel for telephone consultation.
4. Browser problem: Many platforms have certain requirements for operating computer systems and browsers. If the configuration is too low, you can't open a web page or upload files. The following provides the configuration required for the common platform of the system and browser:
Operating System: Recommended win7 Ultimate Edition (Full Edition)
Browser: IE9 or above (Google browser, Firefox browser and 360 browser are recommended).
Office:2007 and above (not allowed in 2003 and wps, please uninstall).
Third, the network problem.
Because the general file has more content and larger volume, it takes a long time to upload. If you encounter network failure or instantaneous disconnection during this period, the upload operation will be interrupted.
Moreover, because uploading files with web tools does not have the function of breakpoint continuation, once disconnected, it needs to be retransmitted, so a relatively safe and stable network environment is needed when uploading files.