You can upload images in the Designer by going to Tools -> Image Management
Once you upload the image, you can right click the image in the Image Manager and click “Copy Path”
In the perspective image component’s source prop, enter “/system/images/{path you copied}” (for example: “/system/images/image.png”)
Icon paths are different. Icon paths are formatted like so: {icon library name}/{icon name} (for example: “material/insert_emoticon”)
The only icon library we have right now is “material” - you can find the icon names for this library here: https://material.io/tools/icons/