OCR paper upload

Upload a scan or preprint not well-indexed by the live sources - it's added to your map as a node.

Bring in what the indexes don't have

A scanned document or an obscure preprint that federated search doesn't surface still needs to be part of the review. Upload it and it's OCR'd, its own reference list is extracted, and it's added to your map as a real node - citable and linkable the same as anything found via search.