Can't move an RIS-imported reference to another collection
                    When I import a RIS file from EBSCO or some other such site, it creates a new collection entitled EBSCO-Metadata-Date. The reference shows up fine but I cannot move it to another collection. How can I resolve this?                
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See the last paragraph here https://www.zotero.org/support/collections_and_tags#adding_items_to_collections