Connect with and learn from others in the QuickBooks Community.
Let me help share information about how you can setup a scanner for you to attach a document in QuickBooks.
To start with, make sure the scanner you're about to sync is of the following devices listed below:
From here, you can follow the steps outlined in this article in setting it up with troubleshooting steps included: Scan and attach documents to transactions.
Additionally, I've got you this helpful article for a compilation of references you use while working with your documents: QuickBooks Document Center: FAQs and common issues.
If there's anything else that I can help you with, please let me know in the comments below. Stay safe!