In your InterestViewController, you're passing var selectedImage: String?. But this is just a string, and then you're trying to get the image with that

if let imageToLoad = selectedImage {
            imageView.image = UIImage(named: imageToLoad)
        }

But you don't have such image in your assets catalogue, so you cannot retrieve it like that.

As you saved image in ViewControlle as

let imagePath = getDocumentsDirectory().appendingPathComponent(imageName)

        ///convert UIImage to Data object so it can be saved
        if let jpegData = image.jpegData(compressionQuality: 0.8) {
            ///write image to disk
            try? jpegData.write(to: imagePath)
        }

so you'll have to get it back from that directory the same way.

Something like that should do the job:

class InterestViewController: UIViewController {

  @IBOutlet weak var imageView: UIImageView!
  var selectedImage: String?

  override func viewDidLoad() {
    super.viewDidLoad()

    if let image = selectedImage {
      let path = getDocumentsDirectory().appendingPathComponent(image)
      imageView.image = UIImage(contentsOfFile: path.path)
    }
  }

  func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return paths[0]
  }

}