If the directory where the original file is located can be written as follows: After upgrading, the original file will be deleted, and the upgraded high-quality file will be replaced by the original file with the same file name.

If the directory where the original file is located cannot be written: the upgraded music file will be placed in a directory named "Sound Quality Upgrade" in the cloud music installation directory, and the original file will not be deleted.

Note that you can't write the directory where the original file is located, that is to say, for example, the folder has only read permission, and the directory of the external sdcard of Android4.4 system.