The Canon PIXMA G7020 reports the supported dimensions of the flatbed,
but its automatic document feeder supports larger paper sizes.
Fortunately, *scanserv-js* provides a (somewhat kludgey) mechanism to
override the reported settings with more appropriate values.
*scanserv-js* is a web-based front-end for SANE. It allows scanning
documents from a browser.
Using the `config.local.js` file, we implement the `afterScan` hook to
automatically upload scanned files to *paperless-ngx* using its REST
API.
