OnMouseButtonDown isn't fired in widget component

Development Programming & Scripting UI
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I’m trying to create a character drag’n’drop interaction with menu:

  1. I have a list of “slots” as a widgets.
  2. A number of characters in level, they are actors with Spine2d meshes.
  3. I want to be able to click on character in level and then drag’n’drop his silhouette to the slot and then change a slot slate to display image of this character.

I can make drag’n’drop work for when I’m clicking on the widget (essentially using official manual for that - Creating Drag and Drop UI | Unreal Engine Documentation), but if I add that widget as a component to the character in the level - OnMouseButtonDown just doesn’t work.

Does anyone know what I’m missing?