Files showing status of files in iCloud as "error"
I have recently enabled iCloud Drive on my iMac (Sequoia 15.6.1). It all seemed to sync ok, but a random selection of files show the "!" symbol and hovering reveals the message "error". I've checked the meaning of symbols and this one is supposed to indicate that the file could not be uploaded because the iCloud Drive is full.
In fact, the drive has 130Gb available. My desktop iMac has 511Gb, so it's not as has bee suggested in earlier posts that the hard drive is nearly full.
I have also opened files with this status on both the desktop and in Safari from iCloud Drive. The files opened in both cases so they must exist in both locations.
Why, then, is the ! symbol showing on this random selection of files on my iMac?! They are spread across a number of folders and subfolders, so there is no logical reason that I can see for this to happen. The folders marked with ! contain a number of files marked!.
Any help would be appreciated.
iMac 27″, macOS 15.6