Viewing a set in slate's resources manager. Note the options along the toolbar at the top. The' empty set' and 'delete set' are new in this version. If there was an item in the bucket you'd notice that you can now add one item at a time to a set if need be. Also, the bucket will only show items that can be added to the set. So if your bucket contains audio and image files but you're looking at an image set you'll only have the image files showing with a little note saying your audio files don't show. Ok, long sentence.
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