PDF indexing and metadata retrieving in b4

When I drag and drop pdf's from a directory on either my pc or my macbook, they don't get indexed. However, if I double click on that unindexed pdf within zotero (thereby opening it up in firefox) and click the "Create new item from current page", everything works flawlessly. Any ideas on why the drag and drop doesn't work?

I couldn't find any discussions that seemed to answer this specifically. Apologies if it's already been addressed.

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