I reported a file copy and rename bug in the file manager almost 2 months ago but that issue never got resolved either and everytime I get these errors, I have to delete those files and upload em all over again.
Worst of all, when I get these copy errors, it doesn't even show the names of files which failed to copy. So I have to go through each and every file, trying to find the ones which failed to copy. Its like trying to find a needle in a haystack.