Can a check box appear if a document is attached?

I've used the details from the this post (https://community.adobe.com/t5/acrobat-discussions/add-an-quot-attach-file-quot-button-to-a-pdf-form/m-p/8812972#M36349) and they work great - my clients can now attach a document to the pdf before they send it back to me.

But what I would like to do is have a pre-checked check box appear when a document has actually been attached. I can make a check box appear by mouse up -show/hide when the Client ID button is pressed, but I don't know how to make it appear ONLY if something is attached, and not just if the button is pressed. Is this even possible?