user permission

I can help you with setting the user permission of the employee to attach a file, @Kcrbean.

You can attach documents to transactions, accounts, customer names, vendor names, employee names, other names, and inventory items in QuickBooks Desktop. You'll just make sure to give full access to the employee to which part he's going to attach the file. 

To set the user restriction, follow the steps below:

1. Go to the Company menu, choose Set Up Users and Password and then Set up Users.
2. Select Add User and fill out the User Name, Password, and Confirm Password fields, then select Next.
3. On the window that appears choose which area of QuickBooks the user has access to, then select Next.
4. Select Finish once you're done. 

You can refer to the following article for more information with adding or editing user restrictions: QuickBooks Desktop Users and Restrictions.

Here also an article that tells you more about attaching of documents and on how to fix errors in case you'd encounter one: QuickBooks Document Center: FAQs and common issues.

Let me know if you still need help setting up your user permission and or anything else by leaving a comment below. Take care and have a great rest of the day!