I used to be able to drag a topic over an image and it automatically created a hyperlink when the image is clicked.
How do I do that in RH 2020?
I don't think it is possible. Assuming you have tried and confirmed that, it's a feature request.
Please follow this link to request features. https://tracker.adobe.com
Post the link to your feature request in this thread and others can vote for it. The more people who do so, the higher it gets prioritised.
Thanks Peter! Feature requested.