The filmmaker wants to know how you engage with their work. As you watch their cut on a desk/laptop screen, and in some cases right on the phone, you will react in the moment via swipes on an iPhone, the volume button on an Android, or the arrow keys on a keyboard. The device choice for recording reactions is yours.
"Undo" deletes your most recent reactions, and voice notes can be recorded for stronger, specific reactions. Once the screening is complete, "End Session" opens to an engagement report, where your recorded voice notes can be amended and reactions finalized with the "Send Report" button.
Not sure what to do for your specific screening? Answer a couple quick questions below and this'll tell you exactly what to do.