Hi Chris. Thank you for you reply.
The software that I use for tagging my files (including .dsf) is TAG&RENAME and I get the tags that I want from the folder name and subfolder name (Artist + Album) and the song title from the file name itself. Then, I place the cover art in the directory where the songs are located and name this file “Folder.jpg”. The size of those files are small. Always less than 200 Ko, usually near 100 Ko, and those files are not embedded as a tag in the music file. And this way of doing it works for all files except for DSD (.dsf).
I taught that, maybe, it would work if the covert art was embedded as a tag in the music file so I tried it, but it doesn’t work either.