Get the mp3tag free software. There is a field called Discnumber for each song. Make it a “1” for all disc 1 songs, “2” for disc 2 and so on.
When you have a compilation album, be sure to make the Album Artist field say “Various Artists” on each track (don’t put the quote marks in on any of the fields).
Make sure the Track# fields are OK. They probably are.
Once you have done all that, dump all of the tracks into the Vol 1 folder. Get rid of the empty folders, then rename the remaining folder as the album title, minus the “Vol 1” text.
The albums in question are volumes released separately, sometimes years apart that I would prefer to keep separate.
I don’t recall having this issue in the past
in situations like this where I can’t get the echos to play the album I want, Using the plex app on my phone I create a plex playlist called Now which only contains the album in question.
I then say Alexa tell plex to play the playlist Now
I also noticed with eg: “now thats what I call music” album series that plex will only play the first album listed alphabetically and ignore all others no matter how you phrase the request.
I now use mymedia for alexa for music playback and it does not have this issue.