Could not see images in the figure


I tried to insert multiple images to the figure but I could not see these in my chart.
The example in this link “” is working but when I change the image with any image link in google. The graph does not show anything. like:

Strangely, I can still see it in the thumbnail image in my home folder. like graph below

Apart from this, I also could not upload image in dashboard, it was always freezing.
I tried it with different browser, but it does not work as well.
Can anyone help me with this?

Thank you.