The only thing you did different was post the right link after putting it in the little yellow picture box. See even I can post the same picture using that link.
This is the basic link, see brown underlined link below, it won't show as a picture unless you put it in the address line of the Yellow box that shows up when you are creating a post,
After U click on the Yellow box, this shows up and you paste the link into the box
but if you click on the link it will show up as a picture on the "PostImage" site you loaded it to..
https://i.postimg.cc/NFkKGKgZ/IMG-1494.jpg (
https://postimages.org/)
Once put into the dialogue box that comes up after u click on the Yellow box it shows up as a picture right in your post.