Animoto - https://animoto.com/
InVideo - https://invideo.io/

Rive - https://rive.app/

Although Rive is vector based and will not incorporate image based graphics or video, it is very lightweight and optimized for mobile. Vector animations can be very fun, although a word of caution in this area - there is such a thing as too much, and just because we can doesn't mean we should. Subtle works. 

Tome - https://beta.tome.app/

Pitch decks, generated assets, format baked in... What more could you ask for?