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func downloadImage(from storageImagePath: String) {
        // 1. Get a filePath to save the image at
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        let documentsDirectory = paths[0]
        let filePath = "file:\(documentsDirectory)/myimage.jpg"
        // 2. Get the url of that file path
        guard let fileURL = URL(string: filePath) else { return }

        // 3. Start download of image and write it to the file url
        storageDownloadTask = storageRef.child(storageImagePath).write(toFile: fileURL, completion: { (url, error) in