We can confirm that the image is uploaded to file server successfully:

/data/clearml/data/fileserver/examples/register image.b8bd8c27aaa6416a9b870cdc3878a4f3/metrics/image/image PIL ll
total 12K
-rw-r--r-- 1 london london 12K Apr 25 10:16 'image_image PIL_00000000.jpeg'

For some reasons, the front-end could not grab/display the image