The Highlights page on the app is the same for each user on the app and are managed on the website. You are now able to manage the banner image yourselves!
(For more information on the Highlights page and managing this, please see the support article here).
Your banner placeholder image will need to be 2048x950
To upload your image, first navigate to ONE Admin > App Management > Highlights
You will now see an additional option to manage your banner image:
Click 'Select Image' and load your banner image > Save
Make sure to Sync your app to view the updated image 🙌