You can schedule an import from a selected file on the server or external URL.
To enable scheduled import set the file server path or file URL on Product CSV settings screen:
As soon as you fill the Remote CSV file location field the scheduled import will start.
Local server path or URL?
If you set the file location on the same server that your website is located the importer will know if the file is already parsed. It will also rename the file after it is parsed so you can keep the update history.
If you select the correct ‘check for updates every’ setting to avoid importing the same data multiple times and remove or replace the file once it is parsed.