One more update... the iCloud Drive dialogue, having stopped moving (in any direction) was static and unchanging for about an hour "23,485 items and 3.68 GB of 3.68 GB". I tried disabling iCloud in preferences again. It (again) informed me that iCloud was updating files and asked if I wanted to terminate. I selected yet. And... iCloud was disabled! So now Finder is functioning, the desktop is visible again. Of course, my Documents and Desktop files are gone from my Mac. All appeared to be copacetic. I checked iCloud Drive on the web and everything seemed to be in their proper locations. No large files. So... not to tempt fate but I re-enabled iCloud Drive. So far, nothing is crashing, The iCloud Drive folder is visible and shows a dialogue of "Setting up iCloud Drive". The Documents and Desktop folder are visible (but no files synced yet). So whatever happened was related to large files that were on the Desktop and removed before they had a chance to upload fully.

I moved my last comments to a separate thread. Not sure how to delete these. Still having problems, tho.

UPDATE: the "Uploading x items" dialogue seems to be going down at about the same pace as it was previously increasing. Also, the total number of GBs out of X seems to be going down as well. Currently sits at "Uploading 258,000 items" and "78 GB of 444 GB" Network usage doesn't appear to be spiking on Activity Monitor. Will post results later.

Also, what's odd is that I'm able to click on the iCloud activity icon (turns into an "i" and the Uploading x items dialogue pops up). The dialogue shows a rapidly increasing number of items (210,000 at last count) and below that "43GB of 561GB" both numbers increasing. What's interesting is that in Activity Monitor there doesn't appear to be any significant network activity up or down. For kicks I tried to figure out what the upload speed is and it clocked in 10GB per minute which is not possible even with my fiber connection. My upload speeds via Speed Test are around 20Mb/Sec (download is 200). So not sure what is going on. It says it is uploading (now 233,000 items, as I write this) but clearly, that is not happening. I guess I'll wait it out and see what happens. Maybe it is counting the files to upload. But poor functionality, I guess.

I'm having a major problem with iCloud Drive. I happened to copy a large photo library to the desktop (and didn't realize I had Desktop and Documents enabled). It is attempting to upload 600GB to iCloud. I moved the file from the desktop to another non-iCloud folder, but it still appears to be attempting to upload it. Now, it is crashing the finder whenever iCloud folders are selected in the sidebar. I have no way to select iCloud folders any other way. Won't actually show the desktop and any iCloud enabled apps are having issues as well (Numbers won't launch if I click on the app, though if I open a document from the finder, it will open). I've tried to disable iCloud Drive in preferences, deselect the Desktop+Documents option and restarted numerous times. It is a big problem. I've dutifully submitted feedback through the Beta app (I realize that this is a one-way system of feedback so I'm coming to the forums to see what my options are). So far, aside from reinstalling the beta, the only solution that could work is disabling iCloud Drive but that has eluded me as well. Any thoughts would be appreciated.