Summer Secrets Unlocked with Webby is a cartoon short, presumably written by the DuckTales 2017 Promo Department. Starring Webby Vanderquack, it also mentions Scrooge McDuck and Flintheart Glomgold. Various residents of alternate universes can also be seen through dimensional portals, and Toth-Ra is seen in one of the wall murals.
Trapped in a deathtrap-infested temple, Webby finds a portal where she must decode prophetic hieroglyphs which open portals to other dimensions… After decoding all four prophecies, a larger, mysterious, golden portal materializes and Webby jumps through.
Behind the scenes
This DuckTales 2017 short, released in May of 2018 on the Disney Channel YouTube channel, establishes that the Disney Channel series Andi Mack, Raven's Home, Big City Greens and Bunk'd, and the Disney Channel remake of Freaky Friday, all exist as alternate universes to the 2017 Continuum. The short saved as an advertisement for their broadcast on the Channel.