Hi. I tried the following method to show my covers, but it didn't work. Do I have change anything else instead of covers name?

In a JPEG file named folder.jpg in the same folder as the MP3 file. (Much like albumartsmall.jpg,
this is a standard filename also used by Windows explorer.)
Example:
Uploaded MP3 filename: My Music\demo_track.mp3
Cover image filename: My Music\folder.jpg