Hi there, Svgg.

Thank you for visiting the QuickBooks Community. I'll be sharing troubleshooting steps to ensure that you'll be able to import all your data in QuickBooks Online.

Whatever information is showing up on your file or when manually overwriting the details should reflect on the products/services under the Products and Services page. When uploading the file, please make sure to use the correct format and complete details when mapping the items/services to ensure everything is accurate. You can click this article to view further details and how to correctly import data in QBO: Import products and services into QuickBooks Online.

If the issue persists, it could be the cache is full, which is why when you click the import button it only imported one data. I recommend logging in to your QuickBooks account using a private browser. Then, import your data from there. This is to rule out the possibility of a webpage issue, and private browsing doesn't store local files or cache.

Use these keyboard shortcuts based on the browser you're using.

• For Firefox or Microsoft Edge, press Ctrl + Shift + P.
• For Chrome, press Ctrl + Shift + N.
• For Safari, hold down Command + Shift + N.

If it works in incognito, I suggest clearing the cache of your regular browser. This removes the history or log of sites so you can start with a clean slate. You can check this article to see the steps: Clear cache and cookies to fix issues when using QuickBooks Online.

If the steps above didn't work, use another supported browser as alternatives.

Lastly, you may open this article to view different details about importing data to QuickBooks and how it works with various scenarios: Common questions about importing data to QuickBooks Online.

You can always add a comment below if you have any other questions about importing data to QBO. I'm always here to help. Take care!