> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://product-upload.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# My CSV won't import into my store, or I get an "Uploaded file must be of type 'csv'" error

This is almost always a file-handling quirk on your computer or browser, not a problem with the file itself.

Things to try:

* Do not open the file in Excel and re-save it. Excel can change the format or save it as a different file type. Upload the CSV exactly as Product Upload generated it.
* If you see `must be of type 'csv'`, try a different browser. Firefox in particular can mislabel the download's file type, while Chrome or Edge usually upload it cleanly.
* Make sure you are using the importer that matches your platform. BigCommerce and WooCommerce each expect their own CSV format, so download the version for your platform from the **Publish** menu.

| Still stuck? Send us the exact error message and the CSV, and we'll check whether it is a formatting issue on our end.