I have a markdown document in a folder with a sub folder (Pictures) containing the images, the references to the images are;

And these display correctly in the right preview pane.
The images are missing from a PDF export.
I note this was referenced as fixed in 2.1.1.3, I am using 2.5.0.27920.
I can see there are some threads mentioning the problem with workarounds, but no comments on a fix ?
What am I doing wrong ?