Hi, thanks for answering, for the second point I mentioned, just to be clear, these are 2 totally different album from 2 different artists but the 2 albums are called "Faith", it is not a multi-artist album.
I use only the artist tag and set the same artist for all tracks of an album, I leave the albumartist tag empty. All the tracks of my albums share the same tags except title and tracknumber.
In Poweramp, I have the right tracks for the right artists, but the album infos (such as cover and year) are the same for both albums which makes the infos correct for an album and wrong for the other (See screenshot 2 where The Cure's Faith album has Pop Smoke's Faith album cover (and year) even though I embedded The Cure's Faith cover in all tracks (See screenshot 3).