via Andy at the AREN project

https://jywarren.github.io/fisheyegl/example/

We're handling the drop event here: https://github.com/jywarren/fisheyegl/blob/master/example/main.js#L151

I believe this works, from another project: https://publiclab.github.io/PublicLab.Editor/examples/ (the main image upload)

That code is here:

https://github.com/publiclab/PublicLab.Editor/blob/master/src/modules/PublicLab.MainImageModule.js#L62

    _module.dropEl.bind('drop',function(e) { ... });