title: Read from URL obtained from PHImageFileURLKey
body: <p>The Photo Framework for iOS 8 is able to return a URL for images using the PHImageFileURLKey. However I can't seem to read this URL. I only need read access. So far, any place I attempt to use the URL given, it is treated as though the file doesn't exist at all. How can I get data using the URL? </p>
  
  <p>Code that successfully returns PHAssets and a URL:</p>
  
  <pre><code>PHFetchResult* phFetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil]
  PHImageManager *manager = [PHImageManager defaultManager];
  PHImageRequestOptions* options = [[PHImageRequestOptions alloc] init];
  options.synchronous = YES; // Force sequential work. We have nothing to do until this block returns.
  PHAsset* asset = [phFetchResult objectAtIndex:index];
  [manager requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage *resultImage, NSDictionary *info)
   {
       _image = resultImage;
       NSURL* fileURL = [info objectForKey:@"PHImageFileURLKey"];
       _imageLocation = [fileURL relativePath];
   }];
  </code></pre>
  
  <p>Code showing nothing found:</p>
  
  <pre><code>NSURL* fileURL = [info objectForKey:@"PHImageFileURLKey"];
  NSLog(@"File exist?: %d", [[NSFileManager defaultManager] fileExistsAtPath:[fileURL relativePath]]);
  </code></pre>
  
  <p>My current workaround is to take the UIImage given and save it to the /tmp directory and then use that URL. It's not an ideal solution and I'd really like to know the purpose of the PHImageFileURLKey</p>