>> That should be ":results file graphics".
>>
>>
> Thanks very much. This works. I guess this has recently changed. I have
> always used ":results output graphics"
>
>
>
I see that the behaviour changed with 9.3. Release notes (
https://www.orgmode.org/Changes.html) have this:
:file header argument no longer assume "file" :results

The "file" :results value is now mandatory for a code block returning a
link to a file. The :file or :file-ext header arguments no longer imply a
"file" result is expected.

--

Thanks a lot for your help.

Vikas