Open your Android file manager. The app name varies by device but it usually called File Manager My Files or Files . Look for an icon that looks like a folder or hard drive in the app you don have a file manager installed you can download a free one from the Play Store. See this article to learn how. Tap and hold the file name. This selects the file and makes additional icons appear at either the top or bottom of the screen. Tap Rename . You should now see a box containing the file current Tap OK or Done . The file name will update immediately. ordered-list