Image Plugin - not responsive

Hi Balbooa,
Using the image plugin, I'm sure I used to be able to select a different image per responsive view. E.g. One image for the wider desktop and table views, and another for the narrower phone portrait view.
I've just tried on my latest website, but currently only one image can be configured for all responsive views.

Can you please confirm if it should be possible to assign a different image per responsive view.

Many thanks
Marc

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