How to add a CD-ROM to an existing release?

MusicBrainz
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I own this release. There are 3 audio CD & 1 CD-ROM with libretto and synopsis, but CD-ROM is missing on MusicBrainz.

What’s the best way to add it? This post says to add medium as Data CD with no track, but it’s mandatory to add at least one track.

2 Likes
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I didn’t know that, but it will certainly work if you check “I don’t know the tracklist for this medium.”

5 Likes
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@ernstlx is right. You’ll need to check that box to be able to add a blank medium. It is checked in the release I’m linking in my post.