It says this is a broken link but the image is rendering just fine in the previewer.
FWIW I'm seeing a pattern. There are 3 images in this topic. All 3 are identified as broken. All 3 have spaces in the file name. I'm going to use the GUI to add them again and see what happens.
Here's the markdown for both links. The first is what came over from the import. The second one is based on dragging and dropping from DM's folder browser.
Both render properly. Refreshed the link checker and it still identifies the first one as broken.
Poking at this a bit more and the pattern I am seeing is markdown syntax is happy with the relative pathing but html img tags are not.
Removing spaces from image file names also allows the broken link checker to correctly find the file.