This feature is now in testing. It is accessible via the album page.

Currently the album art alternatives are loaded in a list format (see a screenshot in the comments). The alternatives are a bit slow to load at the moment, this will be fixed in a future release.

Hopefully this will be in the next release, around the 24th January.

I’m currently working through some changes to add alternative art to the inbox.

There’s a line per album in the inbox, with alternative art loaded.

If I have the time then I will add filters to the inbox to show or hide alternative art, and/or other response types too so you can just work on alternative art if required. Otherwise I’ll do this in a later release.

There’s also work to be done so that only non compliant artwork shows alternative art. At the moment, all alternative art for all albums is shown.

Hopefully this will be in the next release, around the 24th January.