I'd really like to do exactly this also. @Rahul could you tell us briefly the current best way please? I've seen your (now 3 yr old) gist: Add featured image support in AnsPress question.. not sure if...
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OllyS
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I've just discovered that this unwanted field only appears if "Allow private posts" is turned off in settings... it seems to be the remnant of that option in the Question form.
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