ISL currently doesn't support drag-and-drop of images into the body, but could upload to a CDN and add a link to the message.

When commits are synced to github PRs, this makes screenshots very painful to handle. If the github message is updated with screenshots, then the commit is amended and submitted locally, the screenshots are lost again (it's hard to use sapling commits as the source-of-truth for messages without image upload). I'm not sure theres any way to pull the github message into a local commit either, so github being the source of truth also doesn't work.

Let me know if there's a better workflow here that makes image uploads unnecessary