e.g. https://www.sciencedirect.com/science/chapter/bookseries/abs/pii/S105435892500002X. The SD translator adds a PDF attachment which 404s when unauthenticated. The Connector interprets that as a captcha (presumably) and opens an in-browser captcha popup at https://www.sciencedirect.com/science/chapter/bookseries/abs/pii/S105435892500002X/pdfft?download=true. The user has to close the popup manually.
e.g. https://www.sciencedirect.com/science/chapter/bookseries/abs/pii/S105435892500002X. The SD translator adds a PDF attachment which 404s when unauthenticated. The Connector interprets that as a captcha (presumably) and opens an in-browser captcha popup at https://www.sciencedirect.com/science/chapter/bookseries/abs/pii/S105435892500002X/pdfft?download=true. The user has to close the popup manually.