Empty form-data body when run via runner

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1

Hi,
I have a request that works fine when I send it via the main Postman GUI.

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However, I get an error response when I run it via the collection runner:
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image2474×1003 142 KB

I am not sure how significant it is but the endpoint takes ‘form-data’ as its body which I use to point to a file I want to attach. When run via the Collection Runner the body shows as empty {}.

Is there something additional I need to do to ensure a requests form-data is correctly set when run via the runner?
Thanks
Alan