Dropbox won't automatically add a link to clipboard for a screenshot even though it saves in dropbox

When you enable dropbox to share screenshots and screen recordings using dropbox, part of the deal is that it automatically copies a link to the file on your clipboard.  When I do that, the file goes to dropbox like it should, but it does not upload a link to my clipboard. Reached out to dropbox support, they had me update the app to the latest build, checked my settings etc... They don't know why and just said this

 

"After having the case further investigated, the problem you’re experiencing appears to be caused by another service you’re using and more specifically by the OS settings in regards to the clipboard, not by Dropbox. Unfortunately we’re unable to provide support for third-party apps or services."

 

They can't tell me what the 3rd party service is, just that it's causing it. I don't know if any 3rd party service I use. They can't give me further info and just marked the support ticket closed and told me to ask the community.

 

I'm on a paid plan, I would expect better tech support.

 

This is on a macbook air running Catalina. Works fine on other machines I have. any ideas here?