How do I run the replay gain 2.0 plugin in picard?

I am using Fedora 37 Silverblue, installed picard through flatpak.

$ flatpak info org.musicbrainz.Picard

MusicBrainz Picard - MusicBrainz's music tagger

          ID: org.musicbrainz.Picard
         Ref: app/org.musicbrainz.Picard/x86_64/stable
        Arch: x86_64
      Branch: stable
     Version: 2.8.4
     License: GPL-2.0-or-later
      Origin: flathub
  Collection: org.flathub.Stable
Installation: system
   Installed: 47.1 MB
     Runtime: org.kde.Platform/x86_64/5.15-21.08
         Sdk: org.kde.Sdk/x86_64/5.15-21.08

      Commit: 596bb97fc366dcd868458b65b873bf46c13e08a4cadbb86a7df4b9f52cf29067
      Parent: 74c86f9f7f1d440b17ce6b85affb1f90c5f1e63639d27ad7ca966a9fa8f5ecbb
     Subject: Update picard.git to 2.8.4 (15026a77)
        Date: 2022-11-22 16:19:54 +0000

I installed the replaygain 2.0 plugin:
Screenshot from 2022-11-29 23-29-54

Also downloaded regain and specified location just in case despite the update in the replaygain 2.0 thread saying flatpak supports it. Not very sure how I would set the path to make it work without the external binary.

Anyways, the main concern is I have no way of activating the plugin.

My eyes cannot find the option called “plugin” → “replaygain” as the explanation specifies.

Select one or more tracks or albums, then right click and select Plugin->Calculate ReplayGain. The plugin will calculate ReplayGain information for the selected items and display the results in the metadata window. Click the save button to write the tags to file.

I have been stuck on this for months. Please let me know your thoughts.

You need to add the files to a release (so they show in the right pane instead of the left). Then you will see the option. Perhaps this should be clarified in the plugin description.

Oh thank god. I have not used the release function for a long time since I want to tag my own stuff.