Can't see Album Art

[Alandbush]

(19-09-2020 11:12)VikasMG Wrote:  The artwork files must be embedded in the audio files ...

Are you sure? Is the artwork displayed by other apps?
Do you have a tag editor program to confirm your suspicion?

(19-09-2020 11:12)VikasMG Wrote:  MinimServe doesn't show the artwork.

I have read that the Naim hardware sometimes needs rebooting to refresh artwork.

As a further test, try adding artwork to one album folder as a folder.jpg.
You may need to restart MinimServer for this new file to be recognised.