Behind the scenes
This live-action commercial was broadcast in 1986 (though DuckTales itself was only released in 1987, as were the plushes advertised by the short). As such, it ended up being the effective debut of the character of Webby Vanderquack (here referred to as only “Webbigail”) and of the DuckTales Theme, in an early shorter version with altered lyrics.
Being a commercial for Duck plushes, the DuckTales Plush Toys Commercial tells its story by way of children playing with the plushes in question and fashioning a narrative out of it. Much as with LEGO Princess - Share Your Story and other such "narrative toy commercials", it is of course the narrative featuring the Disney characters which is considered canonical on this Wiki, and not the frame story of playing children.