I am using GitHub Pages, Jekyll, and Prose to manage a Website. Everything works fine, besides I cannot find a way to upload images. The Prose image uploader is not working
The workaround I use, is to base64 encode images, here is one tool that will do that for you (it even offers image optimization): https://www.base64-image.de/
Then you can just click copy image and that will give you a long string of characters that can be used inside of an 's src="", or a markdown embedded image .
I did that for this blog post I wrote from a ChromeBook:
https://ryanpcmcquen.org/javascript/2015/10/20/fix-hackpad-printing.html
The screenshots there are base64!