Do you mean:
every track is a separate wav file or do you mean
each CD is one continuous wav file ?
will never work in Plex
For 1) you must either follow this guide to the letter:
https://support.plex.tv/articles/200265296-adding-music-media-from-folders/
Or this one:
I am going to do a bit of copy/paste of posts I did in the Plex Pass only forums:
=====
1.“Various Artists” is the usual choice for ‘Sampler’ style albums. There may be exceptions for ‘collaboration’ albums which are credited to all participating artists on the album cover.
2. use the title of the single as it appears on the cover. You can augment that information with (CDM) or (single) or (Maxi) or (EP) as it fits. If it is a genuine release, Gracenote should have no problem identifying it.
…
Then you can add the cover art and lyrics like this:
Little tip:
If you have lots of bootlegs etc. you want to bring your embedded metatags into order first.
Then you need to have the Local Media Assets agent in top position. I wouldn’t trust last.fm to fetch correct info about bootlegs and special editions of albums, like those recent expanded re-releases of Zappa albums.
Put as much info into the meta tags as possible. Put a cover art inside the album folder and you should be good.
Makes sure to set at least ‘AlbumArtist’ and ‘AlbumTitle’ to…
However, in my personal opinion, you are better off if you convert these tracks to Flac format. This will not only save about 35% of space, but also add the ability to insert meta tags into the files. All that while retaining the full quality of the files.