MyScript cannot be used to open image files such as JPG, PDF, because it is not based on Optical Character Recognition technology.

MyScript uses an online signal (digital ink) which is richer than the mere optical signal from an image (made of pixels). It provides a clean digital signal which includes dynamic information about the X Y coordinates capture sequence and allows reaching much accurate handwriting recognition results. This digital ink can be captured using digital pens or any touch sensitive device such as touchscreen tablets and smartphones.

You will need to use some kind of OCR software to try and recognize scanned notes.