- Use under normal lighting conditions.
- Do not cover any part of the printed area.
- Might not work if the lighting conditions are too bright or too dark.
- Might not work if you hold the printout too close or too far back.
- You need to have the latest version of Adobe Flash Player installed.
- Apple users: Allow > Settings > Camera > USB Video Class Video.
- iSight problems with Flash: please, refer to this thread for a solution.