[iMac 2017] Downloading from iCloud stuck

Aloha y'all...

I am trying to download files from iCloud (storage) and the download process is stuck.

For context, I have two network pipes and they are working just fine. The *problem* is that somewhere along the way, I selected the wrong folders to download, so instead of downloading a select number of subfolders with polite sizes- my iMac is trying to download some 670 GB from iCloud and it's been stuck at 84.12 GB for days. (I'll admit that while it's possible my pipes may have hit a cap- given the amount of data, a cap is not the problem; an overzealous download is.)

The problem? How can I cancel this download? (Before answering, please keep reading...)

• The "x" for cancelling the download is greyed out and non-responsive (and it has been like this since Thursday, Feb 16th- when I first tried noticed and to correct my mistake. In addition, the greyed-out status persists through restarts.)

• Deactivating network connections pauses the download, but the "x" is still greyed out
  • (FWIW, This is the behavior I would expect in this context.)

• Restarting or shutting down and starting up again doesn't make any difference.
  • (Again, this is the behavior I would expect in this context.)

So, repeating my question: How can I cancel this download?

Is there a specific process or process family I could kill? And if so, what else would I need to do to actually register the cancellation with iCloud and my iMac.

Mahalo!