@Joan M - if you mean trigger the download automatically when a book with no tags is added the answer is no, there's no way to do that.
If you do a search for tags:false that will show all books without any tags.
If you mark books as they're added (setting in Preferences->Add Books) then a search of marked:true and tags:false immediately after adding a batch of books will show books just added that have no tags. Select them all (Ctrl+A), do a bulk down load (CTRL+D),
If you're in a Virtual Library that will limit the scope of the searches, so they're best done in the All Books VL.
BR
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