Plex has merged two albums - how do I separate them?

[GoodDogs]

Server Version#: 1.19.4.2935
Player Version#: 4.30.2

Hi,
I have four different releases of Roger Waters’ Amused to Death.
Each of them is tagged correctly with MusicBrainz tags:

Because ALL of my music is tagged correctly with MB tags, my library has “Prefer local metadata” selected, (I think that’s the right thing to do).

Plex has imported those four releases into three albums:

One of the three albums in Plex has the tracks from two releases.

How do I split these into their correct two albums?

Thanks

[FeMaster]

Is each album in it’s own, uniquely named folder? If not, I’d start with that.

[GoodDogs]

Yes. Different folders. Different MB release IDs.

My reading of Prefer Local however was that directory structure would be irrelevant anyway.