**Update again, 2 years later (5/24/23): Format seems to have slightly changed again, so use this one:**
`[![optional size keyword, full size is shown if none of these are written in here: large/medium/small/tiny](https://imageURL.png)](https://linkURL.com)`
Just replace the first URL with the image one, and the second with the link one.
Shouldn't have anymore linking issues ([tested here](/forums/meta/topics/an-image-i-can-no-longer-find/posts/5458969/history)).