Upstairs (1919)

While working as a dishwasher in a fashionable New York hotel, Elsie MacFarland often sneaks upstairs to enviously peek at the people dancing to jazz music. Seeing the attractive Elsie dressed in a boy's uniform, wealthy Lemuel Stallings wagers a friend that he can get Elsie onto the dance floor....

Unfortunately the movie Upstairs is not yet available on HBO Max.