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After a collection is built only the items that you have enabled to display in the LUNA Viewer will be available to your audience. This can be done automatically in the LUNA Uploader or manually in the Record Editor. To see all items in a collection which are available in the LUNA Viewer simply click on use the "In LUNA Viewer" filterOther Criteria" menu in the advanced search. You'll also know an item is being displayed in the LUNA Viewer when you see the little green indicator on the media item thumbnail:
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