you can use “insert more break” which is in the post menu put before text.
I founded it. in new post menu
choose one picture for the featured image.
format : choose gallery
and picture 2, 3,.. click “add media” > “insert media” > choose picture you want.
publish! you’ll see slider gallery feature in the post.
Thank you Very much Anders
I found the same problem. Thank you very much.
