Upload the image that you want to create a marker for. Should be a square image or it will be cropped. Keep in mind that you will need a unique marker image for every interaction.
Please keep in mind some criteria for good marker images:<ul><li>High color contrast, ideally black and white</li><li>Asymmetry</li><li>The internal resolution of a marker is 16 x 16 pixels, using larger images can make marker detection worse</li><li>Single characters or short words yield good results</li></ul>