Copy/pasting a web image URL into a notecard automatically creates the image markdown, and links to the pasted URL. This works fine in the short-term, but my concern is that this could be creating a long-term issue for Supernotes. What happens when that website stops hosting that image, or simply changes their hosting location/setup? Then the image will be broken in the notecard, and the note author may never be able to find it again. That will likely be a frustrating user experience.
A potential solution
When any web image URL is pasted into a notecard, automatically trigger the same S3 upload that happens when a user uploads a local image. Link to that S3 URL in the image markdown.
Ta-da! Permanent images for our permanent notes!