How to use the drag-and-drop on any custom plugin in Crepe？

[94mashiro]

I've used the iframe plugin in Crepe Editor via documentation and that's fine.
But I found that this iframe element can't be dragged and dropped by handler like other built-in elements, how can I make this custom plugin element also have this ability, please give me some guidance.

[Saul-Mirone]

It should work automatically. Maybe you didn't set group: 'block' in your iframe node schema.