Simple drawing app, upload to DropBox?

Been beating my head against this one for a while. First of all, seems like it’s not quite possible to turn an oF IOS graphics context into an image that you can save locally on, say, an iPad. Secondly, how might I upload that image to a shared DropBox folder? Is IOS essentially unsupported these days? I wrote a JavaScript/HTML5 web app that does what I need it’s just kind of slow.