I've just released fixes for two issues you might have experienced while using InstantCard:
- Some images loaded from URLs with particular characters in weren't loading correctly. All image URLs are now encoded before being sent off as part of a request which should mean they all load now.
- Images loaded from Unsplash also sometimes rendered as a black square when downloaded. Converting them into a local resource (to bypass any CORS issues) will mean they all render as you see them when editing your card.