Single-store App
Styling options for apps that only connect to one store.
On your Dashboard, Click on Styling.
Then click App - Home Screen Styling.
On the right-hand side, first check the required picture specifications for the image that you will be uploading.
Then click Upload Image once you have a suitable file.
Move the zoom bar to the left or right as most appropriate and click Save.
Click Save Changes. You will see your image saved as above for this store.
Multi-Store App
If you have a multi-store app, you can give each of your stores a separate image. You’ll need to set each of these separately by following these instructions on each store's Dashboard.
On your Dashboard, navigate to Styling.
Then click App - List Screen Styling.
On the right-hand side, first check the required picture specifications for the image that you will be uploading.
Then click Upload Image once you have a suitable file.
Move the zoom bar to the left or right as most appropriate and click Save.
Click Save Changes. You will see your image saved as above for this store
Repeat these steps for your other stores if you have multiple stores.