How to create gallery format posts?

Try going on your post and create a gallery on the add media but don’t insert it on the post. See if it start to work but make sure the image is attached to the post on the library.

What worked for me is adding images in the post. Updating it, removing the images and then updating it again. You can check an example of the result at https://met-dt.nl/en/website-dying-hippos/

This works, but how do I change later a picture or delete it?

Hi.. I’ve try it but the gallery takes only 2 images..

@donillo Same problem encountered. Since I don’t make a lot of messages. I just copy-paste everything into a new message except the one I want to remove.

@newmediologo Did you set the post to Gallery? Did you change anything in the functions.php file? As you can see from this page, it is able to show more than two:
https://met-dt.nl/en/comic-website/

Yes, post set to gallery and no change in functions.php

@michiel

But You add ALL the images to the post and update it and after delete ALL images and re-update it of one image at time..? Thanks..:-)

Yes I add all the images into the Editor. Then press update. Then remove all the images from the Editor. Then update again. That’s it.