This is a very specific note, but I thought if someone was hunting for it, it might be helpful. In Spark Post you can now license your Adobe Stock images, but after forgetting how to do it twice, I thought I’d write it down!
You simply choose the information icon on the page where you edit the image. (Tap the image first to get to this page.) Then you have the option to license and download. You can do your design with the preview image and then just license the selection(s) you’ll actually use.