Instead of copying the image files to our app directory when a photo is captured using a camera or picked from the device gallery, we can move the picture file completely to avoid file redundancy. In order to do this, we can simply replace file.copyTo() with file.moveTo() in FileManager and change the method name to moveFileToDirectory.

Instead of only deleting the file reference in the Local Storage when removing a memo (or memos) as requested by the removeMemo() or removeAllMemos() methods of MemoManager, we can delete the physical files as well using the remove() method of the FileEntry Cordova object and adding this to a new method (deleteFile) of FileManager. The deleteFile() method will be called by the removeMemo() and removeAllMemos() methods to make sure that the memo files are completely removed from the device's filesystem...