jQuery Sortable how to set all children as a drop target

I found this greate plugin: https://johnny.github.io/jquery-sortable/

I would like to have possibilty to drop daggable elements into every child. I've tried to do this adding an empty <ol></ol> but it dosnt work on run. I would have to do this before I build sortable tree. But I do everything dynamically.

And according to documentation:

name: drop
default: true
description: If true, items can be droped onto this container

So I understand that it should work that way out of the box?

Please help.

I figure it out.

The working solution:

$("ol.sortable").sortable({
  // animation on drop
  onDrop: function  (item, targetContainer, _super) {
    var clonedItem = $('<li/>').css({height: 0})
    item.before(clonedItem)
    clonedItem.animate({'height': item.height()})

    item.animate(clonedItem.position(), function  () {
      clonedItem.detach()
      _super(item)
    })
  }
})

I think that removing this fragment:

  group: 'simple_with_animation',
  pullPlaceholder: false,

from configuration helped.