The phrase "first promo" refers to the initial promotion or advertisement of something, usually a product or event. It is the first opportunity to publicize and create awareness about it. Full definition
A Very Murray Christmas trailer: Bill Murray gets down with the kids in first promo for holiday comedy special. (thehollywoodnews.com)
A new promotional image has been unveiled for Warner Bros. as - yet - untitled Fantastic Beasts and Where to Find Them sequel teasing philosopher and alchemist Nicholas Flamel, who will be portrayed in the film by Brontis Jodorowsky; check it out here... SEE ALSO: First promo image for Fantastic Beasts and Where to Find Them 2 Fantastic Beasts 2 opens -LSB-...] (flickeringmyth.com)
«Spectre» has infiltrated television with the minute - long first promo spot for the 24th James Bond film. (cbr.com)