Can some one explain how MO’S algorithm with update query works?

MO’S algorithm is used to answer queries related to a given array by dividing it into blocks(https://blog.anudeep2011.com/mos-algorithm/).Though i understood general MO’S algorithm but i am facing difficulty to understand MO’S algorithm with updates (https://www.youtube.com/watch?v=gUpfwVRXhNY)

Since articles related to MO’S algorithm with updates is rare can someone who knows it explain it.