Use the URL of your Procurios platform to show the images in the preview.
Svg images are not supported and don't forget to change the "Base url for images (for preview)" field to the link of your Procurios platform so that the images are shown in the preview. The image must be present in your library.
Left: displays logo left + subject right. Center: displays only logo centered, no subject.
For good quality images for retina screens, always use images that are double the size of the logo width.
In case of an e-mailaddress, use mailto: as prefix