App Rejected by Apple Help

Hi,
Im trying to upload my first AR app to the app store, but it got rejected by apple, and I don't know how to fix this issue.

The app must scan a flat surface in order to display a model.

Here it is the apple's response:

We have started the review of your app, but we are not able to continue
because we need a demo QR code or AR marker (image) to fully assess your
app features.
Next Steps
To help us proceed with the review of your app, please provide the demo
details in the App Review Information section for your app in App Store
Connect or reply to this message with the requested demo information.
Please ensure that the information you provide includes any data necessary
to demonstrate the functionality of your app features.
To provide QR codes or images information:

• Log in to App Store Connect

• Click on "My Apps"

• Select your app

• Click on the app version on the left side of the screen

• Scroll down to "App Review Information"

• Provide information in "Notes" as appropriate

• Click "Save"

• Once you've completed all changes, click the "Save" button at the top of

the Version Information page.


I don't know what the QR code must do and how te app should react to it.
If some can help me out with this issue, I would appreciate it a lot.