Is there a way to add a picture to link posts if the link doesn't generate one automatically?

For many links a picture is automatically displayed in the preview. I’m curious if there’s a way to add an image for links that don’t generate one?

I haven't used it, but I think that is what the thumbnail URL input field is supposed to be for.

It is but it doesn't federate.

Ah, cool that it is in progress though, thanks!

I tried that before. Both the URL and the image are fighting for the same field. Uploading an image results in an URL that becomes the URL field.