When you add an existing medium in the release editor, you have to search for it manually, and that search seems to use the indexed search. Because of that, you won’t be able to find a medium in a release that has just been added to the database.

New editors sometimes add a multiple-disc release as one medium, and the easiest way to split that currently is to add the same medium a couple of times and remove the duplicate tracks. But that won’t be possible if the release was added too recently.

Being able to paste the MBID like you can do in almost every other search field in MB would be a great help (and it would probably be useful in other cases as well).