I appreciate you for running some troubleshooting steps to resolve this issue, kate111.

Since the same thing happens, I'd recommend reaching out to our Phone Support team so we can investigate why you're unable to drag or email attachments from your desktop.

You can reach out to them through the Help menu and select QuickBooks Desktop Help.

In addition, feel free to visit our Help Articles page for some references in managing the Doc Center.

Keep me posted if there's anything that I can help with. I want to ensure that this gets resolved.