This video is from a collection of raw footage and out takes from Fox Movietone News. I cut it down to the dance related bits from the footage I found on the University of South Carolina website.
From 1930, at the Poinciana Breakers Casino in Palm Beach Florida, ordinary folks dancing the Fox Trot in the sort of general public dancing that used to be found everywhere.
From the film "The Guilty Generation":(1931) an old fashioned dance mixer.
Joan Crawford dances a naughty Fox Trot with a sailor in "Rain"
An overview of the Foxtrot in the Jazz Age (1920s-1930s) showing its infinite adaptability. All footage is from the era. While dance teachers of the time liked to make distinctions, music publishers, bandleaders and dancers lumped almost any dance in 4/4 or even 2/4 time under the title "Fox Trot" unless it was obviously a Tango.
A Dutch instructional film from 1930, demonstrating the ballroom Foxtrot of the time. Edited by Walter Nelson from silent raw footage found on the Internet Archive. Music is "Easy Come, Easy Go" by Al Bowlly and his orchestra.
From the film "Marihuana", which used an anti-drug message as a cover for some pretty racy stuff. The dance scenes clipped together here show bits of Balboa, Shag and even a bit of Fox Trot right at the end.
Scenes from the 1929 movie "Dance Hall", showing kids dancing the "Collegiate" style while the rest of the room is doing Foxtrot. As a very early talkie, the sound track is terrible, so I substituted "Sweet and Hot" by the Ben Pollack Orchestra. While most of the moves are pretty familiar to the Shag crowd, it is a nice review of the state of play at the end of the Roaring '20s.
Dance scenes from "Abwege" (1928) showing Foxtrot and Tango in a posh Berlin nightclub.
Tango Eine Nacht in Monte Carlo: Marek Weber und sein Orchester
Foxtrot Arpaneetta: Robert Gaden und sein Orchester
Foxtrot Ungaarwein: Barnabas von Geczy und sein Orchester
Jazz Fotrot/One-Step as seen in three different scenes from the Joan Crawford film "Our Dancing Daughters". The music is "I'm Feeling Good" from Gus Arnheim and his Orchestra.