If the screen does not appear after installation, close it. Allow camera permission and restart to work normally.

If the test paper is printed with a mimeograph, the contrast is not as good as the original paper. There are cases where it is difficult to clearly distinguish the pictures that were clearly visible on the original eye paper but not well distinguished on the mimeographed test paper. I remember having a hard time with students who asked questions saying that they couldn't see the picture well every time I took the test.
So, before printing the test paper, I created an app that allows you to check how the picture will look if you copy it.

If you run the app and project it onto the picture on the original sheet, you can predict how the picture will look when printed with a mimeograph.

Since the printing density of mimeographs can be different for each school, you can try adjusting the printing density after pressing the screen to stop it.

Be sure to check once the test questions are finished. If the picture on the test paper looks good when printed later with a mimeograph

If you can't see it well, you can edit it with a picture editing program or re-draw the outline with a ballpoint pen on the printed original sheet.