The actor, who appeared as young Lottie in the hit Paramount+ show, stars in American drama Parachute, the directorial debut of Pitch Perfect star Brittany Snow, who also co-wrote the script with Summer '03's Becca Gleason.
Courtney will star in the film as Riley, who has been "released from rehab for an eating disorder, love addiction and suicide attempt," according to the film's synopsis.
About Fate's Thomas Mann will appear alongside her as Ethan, who strikes up a relationship with Riley after being "released from jail for throwing a wine bottle off a balcony".
A first-look image from the film, which will be screened at Raindance on November 3, shows Courtney and Thomas as Riley and Ethan as the pair embrace and gaze into each other's eyes.
The film's cast also includes Guardians of the Galaxy star Dave Bautista and rapper Kid Cudi alongside Stranger Things' Francesca Reale, Jane The Virgin actor Gina Rodriguez, and Community's Joel McHale.
Parachute is up for a BIFA (British Independent Film Awards) Raindance Discovery Award at the festival, which "highlights innovation, uniqueness of vision, maverick filmmaking and risk-taking, with a budget under £500k and no, or very limited, theatrical distribution deals in place".
This year's nominees also include Dutch Southern's Only The Good Survive, Erika Calmeyer's Storm, and Alejandro Rojas and Juan Sebastián Vásquez film Only The Good Survive.
Speaking to Women's Wear Daily, Brittany spoke about her decision to step behind the camera after starring roles in the likes of X, Prom Night, and John Tucker Must Die.
"I didn't know that I wanted to direct and write," she said. "I thought that maybe I couldn't. But I knew that I wanted to tell the story, and I thought that there's no better person to tell this type of story than someone who has lived it."
Parachute will play at Raindance Film Festival on November 3.
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