Start by clicking the icon with the Shapes in the top right-hand corner.
Then you click on the Upload symbol.
You will then get two options. You can click Choose image to upload an existing photo, or click Take a photo to take a picture directly from what you have written in your notebook.
Now you can take a photo of your calculation by pressing the Camera📷 symbol.
It will then appear directly in the calculation area and you then only need to type the answer into the answer box.