On the Review Summary screen, select the "Import" button.
Once your file is uploaded, you'll be re-directed to your Review Summary page. From here you can monitor the progress of your import.
You can check your import by selecting "View Details" within the "Import References" section.
More import info here: https://support.covidence.org/help/import-2
Covidence automatically de-duplicates during the import process. The process checks for duplicates within the uploading file compared to the previously imported citations.
To identify duplicate references, Covidence checks the title, year, and volume. These must match exactly to trigger removal. The author field is also checked. If authors are similar, the record will be noted as a duplicate.
You can view the duplicates by clicking "Import References" on the "Review Summary" page and then the "# duplicates were removed" link. Citations can be returned to the screening process if you feel the deduplication is in error by clicking on the "not a duplicate" flag.
More de-duplicate info here: https://support.covidence.org/help/viewing-duplicates