You could see an IO error for several different reasons.
- First, make sure your file formats are correct, and the file sizes are no bigger than 100MB.
- If they’re too big, try compressing them into a ZIP file.
- If your files are the right format and size, try clearing your browser’s cache, or uploading the files using another browser, like Chrome or Firefox.
If none of these solutions work, contact community support for help.