Huge iCloud file on PC in \user\appdata\local\packages\appleincicloud_...\localcache\local\logs
Running out of disk space on my PC and found the culprit using WinDirStat, a 64gig log file created by the iCloud app. My solution was to erase the contents of the log file directory and reboot only to return to the directory and file another log file growing without stop.
Windows, Windows 10 (19045)