What the F*ck is a note string or file attachment and why does this stupid error pop up when I try and make a new product from an invoice...

Please know that this isn't the experience we want you to encounter, QoutdoorsNB. Let me assist you address your concern in QuickBooks Online (QBO).

Since you've mentioned that you received a pop-up error upon trying to add a new product from an invoice. Let's perform some basic troubleshooting steps to bypass the cache and cookies that are stored in your browser, which affect the overall performance of your account.

You can follow the steps below:

To begin, sign in to your QuickBooks Online (QBO) account in an incognito window. It will prevent the browser history from being saved.

Please refer to the following keyboard shortcuts based on your browser type:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + N
• Safari: Command + Shift + N

If operating in a private browsing session resolves the issue, you can then clear your browser's cache to remove the cache and cookies that are causing operational issues. This procedure is applicable in all supported browsers and reboots.

Also, I'll share this article in case you want to add and change the item type for a product or service in QBO: Change product and service item types in QuickBooks Online.

Your success is important to us, OutdoorsNB. Please perform these steps and know that you can revisit this thread if you encounter any more issues with adding products to your invoices within QBO. We're always here to help.