Some people reported Windows 10 not copying all files while others said that they can't move files between folders or Windows 10 cannot copy multiple folders. With the little button trick you can change your decision during the process. According to users’ feedback, the file access denied error appears now and then on their device to prevent them from copying or moving files successfully. Windows has rules whether it copies or moves the files when dragging and dropping them with the mouse. This post shows you how to deal with the Windows can’t copy or move files problem efficiently. It would be much depressed when you can’t copy files from external hard drive to computer.