Grok image model fails to show image

I tried grok-imagine-image-pro and had to set the model to ‘OpenAI Responses API (New)’ to pass the Test and set ‘Advanced - Custom Body Params’ to ‘string:prompt:banana’. This didn’t display the image in my Chat prompt which would go to Fetch/XHR-generations-Payload-Messages[1][‘Content’] instead of Fetch/XHR-generations-Payload-prompt. I could get the image URL (of a banana) via Fetch/XHR-generations-Payload-Response. You can delete/edit the form after passing the Test and before saving the model, but you must pass the test to enable the ‘Add Model’/’Update Model’ button. I did find a Grok image plugin that didn’t work for me, although I think it was using FLUX. Maybe all I need is documentation, as Gemini 3 didn’t help.