Hi ​@jackal.chung, welcome to the Box Community! Sorry to hear you’re experiencing issues with uploads.

I understand you’ve already tried some troubleshooting steps, but I’d love to get a better sense of what you’ve attempted so far. If you haven’t done so yet, the following steps often help resolve upload problems in the web app:

• Make sure that your web browser is the latest version of Chrome, Firefox, Safari, or Edge. An out-of-date browser can cause file upload problems.
• Clear your browser's cache.
• Confirm you're using one of our supported operating systems.
• Check that the file name is valid.
  • Box only supports file or folder names that are 255 characters or less. File names containing non-printable ascii, "/" or "\", names with leading or trailing spaces, and the special names “.” and “..” are also unsupported. Box supports only Unicode Basic Multilingual Plane 0 (BMP) characters in file and folder names.
• Check your network connection to Box.
• Temporarily disable or configure your firewall to allow Box as a trusted site.

For more detailed guidance, visit our Troubleshooting Uploads to Box article.

If the issue continues after trying these, please feel free to submit a ​​​​ticket so our Product Support team can take a closer look and assist you further.

Thank you!