Kopernio Premium users can sync their Locker to their Dropbox account. See here for more information on how to get the free premium upgrade: https://kopernio.com/premium.
Follow these steps to set up, remove or change your Dropbox integration.
Select the Integrations tab on your account settings page, then click 'Connect to Dropbox'.
Click 'Allow' to grant the necessary permissions Kopenio need in order to copy the PDFs to your Dropbox account.
You will be notified when syncing has finished:
You will need to remove the integration from both Kopernio and Dropbox in order to sync a different account. Click the 'Disable sync' button in your Kopernio account settings page.
In your Dropbox account, go to Settings > Connected apps. You can remove Kopernio by clicking the x button.