During import, ReadCube does not move, copy or upload your PDF articles.

ReadCube first searches your computer to locate your PDF documents. Once you've selected which PDFs you'd like to import (by using the checkboxes), ReadCube then extracts small fragments of information from each PDF (like the DOI, title, year, or author(s)) and uses this information to uniquely match your PDF with online databases containing citations (PubMed, Google Scholar, CrossRef). Once each PDF is matched with a database entry online, the relevant metadata is downloaded, and your PDF is tagged in your ReadCube library, so you can easily find them in the future.