The preview won't show the og:image - which is what the preview image is created with. But the final post will show it. If you want to make sure your final post will have a preview image, use an Open Graph checker to check the URL you're about to post - for instance, this one.

[–] [email protected] 1 points 18 hours ago* (last edited 18 hours ago) (1 children)

Thanks for your answer. I think my question was misleading. I meant that the final post misses the image at all. And according to the metadata I can not imagine why. For example the link description is there.

[–] [email protected] 1 points 18 hours ago* (last edited 18 hours ago) (1 children)

Ah right okay. I thought you meant the preview while composing the post because I checked your posting history and didn't find the link you're talking about - hence, I figured you probably hadn't tried to post it yet 🙂

Your link checks out. Your post should have a preview image. If it doesn't, it might be a problem with lemmy.world indeed, which wouldn't surprise me on account of the fact that lemmy.world also has issues with previews hosted by my own instance (SDF).

I.e. lemmy.world might have a more general problem with filtering or not handling properly certain images from certain URLs.

[–] [email protected] 1 points 17 hours ago* (last edited 17 hours ago)

Actually I am tinkering around with my own instance and wanted to know if I am doing something wrong.