Currently there is only a small number of hard-coded properties that automatically bind the new item on drag. E.g. dragging a Texture into a DefaultMaterial prompts for property to bind or dragging Effect into SceneEnvironment automatically adds the new effect it to effects property.

It needs to be figured out what properties need this kind of binding. For example, in QtQuick3D and QtQuick3D.Particles3D modules there are probably several missing cases. On the 2D side there are likely plenty of common candidates for this as well.