My upload file ends with .qbo Why does quickbooks online respond with "The uploaded file isn't a valid Web Connect file"?

I can share a couple of steps and info to ensure you can upload the Webconnect file in QuickBooks Online (QBO), @user12839.

The following are the possible reason why you're having the said error message:

• Incorrect file format.
• The .QBO file from your bank isn't compatible with the ones in QuickBooks.
• Browser-related issue to due piled up cache/cookies.

To help fix this, please ensure or check the file format to prevent unexpected error. Then, you can download it again from your bank's website, and re-upload it to QBO. For more info about the steps and the different supported file formats, please refer to this article: Manually upload transactions into QuickBooks Online.

If the same thing happens, please log in to your account using a private window. This can help us determine if it's a browser-related issue due to stored cache. You can use the shortcut keys below to access one:

• Ctrl+ Shift + N for Google Chrome .
• Ctrl + Shift + P for Mozilla Firefox and Microsoft Edge .
• Command + Shift + N for Safari .

Once done, re-upload the said file to QBO. If it works this time, please clear your browser's cache to delete the piled up files that cause unusual QBO responses. 

Then, go back to your regular browser and perform the normal task again. If the issue persists, you can use another supported browser instead.

If you run into some bank upload errors in the future, you can refer to this article for the steps to resolve them: Fix bank upload errors in QBO.

For good practice, you can categorize and match your transactions to ensure they go to the right accounts and prevent any duplicates. Then, you can reconcile your account to make sure your books are correct.

I'm always around to lend a hand if you have more questions about managing your files or banking in QBO. Just add your reply in the comment section and I'll get back to you as quickly as I can. Stay safe and have a great day.