Unknown extension"umap" / Unknown extension "uasset"

Hey all,
I don’t understand this: I’ve seen videos where the author demonstrates dragging and dropping the material/asset/etc, directly into the the contents viewport.
When I do it, the icon switches to a copy icon when I hover over the content viewport, but when I release it I get the the message “unreal failed to import … unknown extension .uasset”
Why? why do I need to go out to Windows Explorer to do this?

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