Hi @Daniel_Tiebor. If you would like an image to fill the background of the whole slide I would select the slide, give it a class and add a background image. You will need to create an additional class for each slide to have those classes have different background images.
If you don’t want an image to fill the whole slide, then you can just drag and drop the image into the slide. You might want to drop a container in the slide first so the image is centered. Then if you want to move the image around you can either give the slide a class and give it padding on the top, or give the image a class and give it margin of the top.
Let me know if this helps.