I was trying to add an image in this question as the OP requested. OP gave the image url which was from
stack.imgur.com. But when I tried to add the image from the URL it show the following error:
I think the issue occurred due to this request.
I tried thrice but failed to upload from the web.
I tried again in this question, but failed.
Edit this question -> Copy the image URL -> Press Ctrl+G -> Select From the web -> Paste URL -> Click Add picture.