I need to quickly see which transactions are missing an attachment. Is there a report that will do this?

Hi there,

Welcome to the Community. QuickBooks offers a variety of reports that help you streamline your work with ease. I'll be happy to share more info so you can continue to do the things you enjoy. 

The report you've described isn't available in the program. I can see the benefit of having this report and I recommend sending feedback to our engineers by clicking on the Gear icon and looking for Feedback.

I also encourage you to check out this article here that goes over the: Reports included in your QuickBooks Online subscription. 

Let me know if this info helps. I'll be one message away in case you need further assistance. Otherwise, I wish you a great rest of the week.