just replace the files in it with the ones you want to change.
however, how to convert .mp3 into .cxf is a problem.
It's easy to convert the. cxf file of the great naval battle into .mp3.
Change the suffix. cxf directly into .mp3, and it will be an MP3 file.
I wonder if this practice can be reversed.
In addition, to the statement of relative downstairs, if you want to avoid automatic update and change back, you can set all music files as read-only properties ~ then it will not be automatically changed.