The ability to post images and links is disabled by default and needs to be manually enabled on an account-by-account basis. It looks like someone already enabled it for you, so try again and see if it works.
April 16, 2020 11:55 p.m.
I still cant see anything from 'preview' and I also use imgur which shouldnt be any problem
this should be the image shown
April 17, 2020 12:21 a.m.
Just checked and figured out your problem. You copied the URL for the page the image was on, not the Image URL itself.
To get the Image URL, right click the image and hit "Copy Image Address" (or "Copy Image URL" or something similar, depending on your browser). That's the URL you will need.