I typed pretty much exactly what’s in your screencast (thanks for taking the time) and tried with several random png images found on google images with just the same result
I’ll try to pull Atom#master and report
Edit: did just that and no difference in output (even after fully restarting atom).
FWIW, I also tried the SVG example (copy pasting from the doc, with different svg files) and the HTML example, none showed in the plot pane. Could it be related to the fact that I’m on a Mac? Can anyone else reproduce this?