Hey! It looks like in their example, they used a /images to go to the root directory of the project rather than using local path manipulations, ../'s. It also looks like that they used a site.baseurl in there too.
Also having trouble (July 2021). I appreciate the tip. It didn’t quite work for me because the baseurl wasn’t complete (the root was missing), but I found a solution by adding the following to the _config.yml file:
Then in a Markdown post, you can just add the ‘imageurl’. For example, for an image called img1.png, I would add it to the post as `![] ( {{ site.imageurl }} /<subfolder_if_any>/img1.png)