You can rename one or several files at once in File Manager.
To rename a file:
Be sure your new file name doesn't contain any special characters, symbols, or spaces. File names can contain only contain upper- or lowercase letters, numbers, underscores, dashes, and periods, and cannot start with a period.
Note: If you rename a file, be sure to adjust any links you may have already created that refer to that file, or the link will break. Learn more.