Change 1000+ of WordPress Featured Images in 5 Minutes! › Forums › Questions and Answers › Pro version not picking up first image › Reply To: Pro version not picking up first image
The reasons for that behaviour are not obvious so I have to guess.
It is unusual that a direct call of an image like https://manndat.de/?attachment_id=14603 redirects to the post which contains that image. It should lead to an attachment page. But I am thinking that is not the reason for your issue.
I am seeing two approaches to try: using the option “Take the first thumbnail of the embedded remote content” and “Take the first attached image”. Did you try them out?