Problem with Post Creation on Forminator Submit

Hi, I have a Forminator contact form and used Tablesome to create a post from the form. Everything seems to work well apart from the Featured Image. The form has a file upload field, but even when an image is uploaded to the form and the file upload field linked to the Post Featured Image field in Tablesome, Tablesome isn’t setting the Featured Image in the created post. Is this a bug, or is there some configuration that I am missing?

I have tried this will all plugins on the site deactivated (except Forminator and Tablesome) and tried with both GeneratePress and Twenty Twenty-Three themes, but still can’t get Featured Image to set.

Many thanks.

Darryl.