Try using the BBCode instead.
On your image's page, click the Share icon in the lower right corner of the page.
Select BBCode
Copy the contents of the box
Paste that into your post
Strip away the "url" tags from that long string of characters, that is, everything in front of the first image tag ("img" in square brackets) and after the second image tag ("/img" in square brackets). Then Finescale's page will show your linked image, like so:
