Desktop Image Well
From Xojo Documentation
The ImageWell control provides an area in which you can display a BMP or PNG image on Windows and Linux or a JPG or PNG image on macOS. You can easily program the ImageWell control to accept a dragged picture.
Image - The image to display.
Do display a picture in the Image Well, simply set its Image property. This code in a Button's Action event assigns a Picture that is included in the project: