File object Preview widget - moving to 2020.1

Hi all

I would like to use the preview function/widget on files in an object but although the setting is there I cannot see where the process is managed to create previews (settings checked against file types)

When I import a new file the preview process does not seem to kick in

My build is pre 2020.1 and imported

I can see the file convert process in detective is failing

will kick off a support ticket