Google Keep also supports having images dragged into it (as seen in the last item below). We’re seeing this ability to “effortlessly insert images” widely rolled out with version 5.22.242 ...

Meanwhile, these images get previewed in the Google Keep homescreen. Available on Android and iOS, they do not sync to the web. You’ll still see note text online, but with no background.

So, it looks like Google will add these new background images to Google Keep via a server-side update. For that to happen, all you can do is wait for your turn.

How to drag images from Google Keep. In order to use this feature, you’ll need to be in split-screen mode on your device. Also, you’ll need to make sure that the other app can take pictures.