I can DND an image onto an image block on the preview

[djay]

actually this one is going to be tricky since the adminUI is the one that needs to do the uploading, not the frontend.
I can't see it working where hydra.js streams the file across the iframe bridge... but who knows.

So realisticly maybe there might have to be some trick to add a invisible drop zone over top of the iframe in the right place? or don't support DND at all? I think even click to select a file to upload is something that can't be initiated from the browser and has to start with a user action so can't be done by the adminUI if the click happened in the frontend....