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Yes, it is possible to upload a file through the Airflow web-server User Interface and activate a DAG. Airflow provides a feature called "DAG Runs" which allows you to trigger a DAG manually by uploading a file or by specifying the execution date and time.

To trigger a DAG manually through the Airflow web-server User Interface, follow the below steps:

1. On the Airflow web-server User Interface, navigate to the DAGs tab.
2. Find the DAG that you want to trigger and click on it to view its details.
3. Click on the "Trigger DAG" button on the top right corner of the page.
4. Choose the execution date and time, or upload a file that contains the execution date and any other parameters required for the DAG.
5. Click on the "Trigger DAG" button to activate the DAG.

Once the DAG is triggered, you can monitor its status and progress through the Airflow web-server User Interface.