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To share a file URL between two instances of your app using UIActivityViewController, you will need to follow these steps:

1. Create an instance of UIActivityViewController with the file URL as the item to share:

let fileURL = URL(string: "file:///path/to/your/file")!
let activityViewController = UIActivityViewController(activityItems: [fileURL], applicationActivities: nil)

1. Set the excludedActivityTypes property of the activityViewController to remove any activities that you don't want to show:

activityViewController.excludedActivityTypes = [.airDrop, .addToReadingList]

1. Present the activityViewController from the view controller where you want to share the file URL:

present(activityViewController, animated: true, completion: nil)

1. When the user selects the instance of your app from the activityViewController, handle the file URL in the appropriate way in the receiving view controller.

func application(_ application: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    // handle the file URL here
    return true
}

By following these steps, you can share a file URL between two instances of your app using UIActivityViewController.