UIDocumentInteractionController annotation property doesn't copy caption to presented application - ios

Question

Thanks to a couple other posts here , I've successfully be able to use the Instagram iPhone hooks to open Instagram and present it with a photo successfully from my application.
(I've made my ViewController class a delegate of UIDocumentInteractionController, and alloc/init'ed a nonatomic/retain property of UIDocumentInteractionController...
However, the key that I put into my NSDictionary that I place in the document controller annotation property will not seem to carry over to Instagram - the caption area is just empty.
How do I deal with this?
Here is my method:
- (void) uploadImageToInstagram:(UIImage *)imageToUpload {
NSLog(#"postToInstagramInBackground");
NSURL *instagramURL = [NSURL URLWithString:#"instagram://app"];
if ([[UIApplication sharedApplication] canOpenURL:instagramURL]) {
// Upscale to 612x612
imageToUpload = [self upscaleImage:imageToUpload];
// Get JPG + IGO Format
NSString *savePath = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents/generate.igo"];
[UIImageJPEGRepresentation(imageToUpload, 1.0) writeToFile:savePath atomically:YES];
// Paths
NSURL *imageURL = [NSURL fileURLWithPath:savePath];
NSURL *igImageHookFile = [[NSURL alloc] initWithString:[[NSString alloc] initWithFormat:#"file://%#",savePath]];
// Setup DocController
self.docController.UTI = #"com.instagram.photo";
self.docController = [self setupControllerWithURL:igImageHookFile usingDelegate:self];
self.docController.annotation = [NSDictionary dictionaryWithObject:#"MyApp" forKey:self.caption.text];
[self.docController setURL:imageURL];
[self.docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES ];
}
else {
NSLog(#"Instagram not installed in this device!\nTo share image please install Instagram.");
}
}
There are a few methods that are called here that I haven't included, one that upscales the image to make sure its 612x612, and one setups the file url for the document controller.

Answer 1

Proper syntax should be
self.docController.annotation = [NSDictionary dictionaryWithObject:self.caption.text forKey:#"InstagramCaption"];