This solved the problem! Thank you, I recap here the correct procedure: go to ~/Library/Application Support/ delete the folder named 'CloudDocs' Open Terminal and type killall bird Done! Now all the eventually corrupted iCloud cache is gone, the files start syncing from scratch and no more cloud icon next to folder and files...

Thank you, this solved the problem of iCloud not syncing or being stuck with cloud icon next to some folders/files. I give below all the correct steps (the terminal command you suggested is not 100% correct, there is a typo): Go to ~/Library/Application Support/ Delete the folder 'CloudDocs' Open Terminal and type killall bird Boom, problem solved: iCloud corrupted cache is gone and files/folder start syncing from scratch and every cloud icon next to folders / files is gone!