Hello @JohnE38 ,
this is actually how Facebook functions. Posts to Facebook will function like posts made directly in Facebook, based on their API restrictions. So adding images will be like uploading an image directly to Facebook, and featuring that in a post. Including a link and no image will trigger Facebook's systems to generate an image automatically, based on images found in the link / the webpage's info.
If you have further questions on post and linking functionality, I'd advise reaching out to Facebook's support.
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