Embed Image doesn't work any more

[mjxbenet]

I and my students have tried a few different urls and the drag and drop feature, but we haven't been able to embed images into any cocreate for a few weeks.

I searched open issues and didn't find this one (apologies if I missed it somewhere)

[edemaine]

Oops, I realize that the proxy server I run was down. Hopefully it should be working again. Let me know it not.