When importing, ReadCube may tag a supplement as an article or vice versa. To correct this, in your library view - click on the file icon and you'll see thumbnails of the files associated to the paper. Click on the arrows to rotate the tag titles to their correct spot.



You can even remove linking of the supplements if they aren't correct. Please note - you can not do this when article is open, only from library view.
http://support.readcube.com/support/solutions/articles/30000024537-an-article-was-mis-labelled-as-a-supplement-or-vice-versa-
support.readcube.com
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