I was able to complete the challenge, save and load images from the documents directory, all works well in the simulator. But when I try to run on real iphone the image save fails. Do you know if I need to enable this functionality somewhere or am I missing something?

I guess you have enabled in Target the: Privacy - Photo Library Additions Usage Description, correct?

As @Bnerd has mentioned that can clearly be a reason. I think I once failed with that inattentively. Check it

Thanks for the feedback. The app access the photo library OK. I seem to be haveing an issue when saving to the image to the documentsdirectory.

    func saveImage(fileName: String) {
        let path = FileManager.documentsDirectory.appendingPathExtension(fileName)

        if let jpegData = yourUIImage.jpegData(compressionQuality: 0.8) {
            do {
                try jpegData.write(to: path, options: [.atomic, .completeFileProtection])
            }
                catch {
                    print("image \(fileName) failed to save")
                }
            }
    }

Again, works on the simulator, but not in the device giving me the catch print message.

Thank you @Fly0strich for your answer. That was my problem and now works well!