Cannot playback files in case another sub dir exists

Volumio Information

Volumio Version: V2.806
Hardware: Pi 3b
DAC: HifiBerry Digi

Changing to a sub directory with flac (or any other audio files) the playback of an audio file does not start when there is a sub directory existing

If there is no sub directory the audio file plays.

What is the problem with that?

Regards

That was a poor explanation of mine.

Let me give an example:

Using Media Server by directories it is possible to play audio files that are stored in //media server/music/rock/beatles/revolver as long as there is not another sub directory like
//media server/music/rock/beatles/revolver/artwork

In the latter case the audio files cannot be started