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  A student was absent on the day of the photographer's visit. How can I add his photo individually?

If your workstation has a webcam, use it to add the student's photo to your computer.
Go to the tab Timetable > Students > Information form, select the student in the list, then double-click right on the photo's location: in the pop-up window, click on the button Activate the webcam, verify that EDT has detected the webcam and, if necessary, adjust the configuration in Video parameters.
Then click on the camera button at the bottom of the frame: the photo you've taken is displayed on the right.