Help mw with Mp3 issue!

Hi friends,
I wish to use my Meizu M8 also as mp3 player but I don't understand how the M8 "reads" the Music folder itself. In one case, I imported a folder with LP and I could associate a cover just renaming the jpg... In case of personal compilations (different artists and albums each), even working with the internal ID3Tag (but also with external one) the songs are indicated in different albums one by one (they stay in one big folder only if the artist is unknown). I thought that the same album name put them together, but it does not happen (automatically) and I just wish it could read the folders as the are in the Meizu disk.. What and how should I modify to have my albums?? By the way, I have 9.3.9 (official) and I will use only official firmware when available...

I have not tried this on the M8, but this trick worked on the M6 :
Original Sampler :

artist name = (varies with each song)
track name = (varies with each song)

modify this to
artist name = "various artists"
track name = "(track artist + track name)"