Paperful

Zotero is good at remembering what you meant to read. It is less good at actually having the PDF. The built-in finder is fine for a handful of items. A messy library with hundreds of gaps is a different job.

Paperful is that job, done on your machine. It reads the catalogue, looks for the missing files, and puts them back into Zotero, in folders that follow your collections. It is not a plugin, and not a website you upload your library to.

Open access comes first. Campus access is there if you have a subscription. Sci-Hub stays off unless you turn it on. Bibliographic fields are left alone unless you choose to apply a patch.

The first version you can actually run is out. I am still deciding how attaching and reporting should feel before I treat it as finished.