API PATCH for image not working

I’ve tried every possible thing I could think of from videos and other forums and can’t find a solution to get an image from an offsite URL to upload through the API PATCH request to save as an image in a CMS Collection. I’ve started with a GET request to see the field info and my PATCH request always says “Field ‘Posteryoutube’: Field no described in schema” and I don’t get it! Here are photos of the GET request results and the PATCH Request results. Can anyone help?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Hi Andrew,

That error message means you added that field to the CMS collection but didn’t publish the site after doing so.

Simply publish the site and then the API call should work.