I was just about to report this changed behavior as a bug, because it appears to be unproductive. From the archival point of view, it is a bad idea to leave an attachment nameless in the Zotero library "Since the parent item row in the items list already displays that metadata" (https://www.zotero.org/support/kb/attachment_title_vs_filename), because the parent item's metadata may change(!) and (since currently Zotero does not automatically update the name of the actual pdf file when its corresponding parent item is changed) the parent item and pdf file name would no longer match. So in order to be sure that the pdf filename and the parent item name match we would have to either (1) open up the pdf's folder in our Zotero folder or (2) click on the attachment, scroll down beneath the pdf preview, and check the filename field -- whereas before in Z6 we could just look at the pdf attachment's name prominently displayed right there in our Zotero library right under the parent item!

It was so useful to easily see a long list of entries with pdfs clearly displaying a name that did not match their respective parent items, then highlight all the pdfs, and click rename! Now we'd have to verify whether the names match or not by examining the pdfs one by one, which is not progress because it makes renaming at scale too tedious.

Might the Z6 functionality be reinstated at least as an option?