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The national college students' career planning contest cannot be uploaded and submitted.
Network problems, file problems, technical failures, time constraints and busy systems.

1. Network problem: The upload failed due to network instability or network failure. Please make sure your network connection is stable, and then try uploading again.

2. File problem: If the uploaded file format is incorrect, the file size is too large or the file name does not meet the requirements, the upload may also fail. Please check whether the file you uploaded meets the rules and requirements of the competition.

3. Technical failure: If there is a technical failure in the uploading platform, the uploading will also fail. Please try to contact the contest organizer or technical support team for help in solving the problem.

4. Time limit: some platforms have upload time limit, which leads to upload failure when the specified time is exceeded. Please ensure that the upload is completed within the specified time.

5. The system is busy: if too many people upload at the same time or the system load is too high, the upload will fail. Please try to upload in a relatively free time.