Thank you so much for starting and continuing to update this thread. We recently made the switch to QBO and, within a week, made the decision to give up and go back to our 2020 Desktop Enterprise QB. The attachment issue was the last straw for me. When I called QB for help, I was told that QBO was not capable of handling pdf attachments - that they had to be in csv format. And then, the rep asked me (and I'm not making this up) if I had a conversion specialist available to help me convert my pdf's to csv format. I hung up and called an audible to go back to our desktop version. I was led to believe that the transition to the online version would be relatively painless but we encountered one headache after another until I finally gave up. I do see some advantages to the online version but, for now, we're going to stick with what we know works. But, again, thank you for weighing in here - it was helpful to know that I wasn't alone. I will check back to see if the issue is ever resolved.