Certain UIActivityViewController services missing from my app - ios

Question

I have implemented UIActivityViewController within my app and can successfully share both strings and images. However, I notice that when you share an image within the iOS Photos app, there are some services that do not appear in my app. Namely Print, Use as Wallpaper, and Assign To Contact, and Photo Stream. My app is able to use Mail, Message, Facebook, Twitter, and Copy just fine.
I am thinking that either:
1.) These extra services have been implemented as custom services within the Photos app using UIActivityItemProvider, UIActivityItemSource, etc..
2.) The data that I am providing is not in the correct format to be used with these services.
I have read through the documentation a few times, but don't seem to see anything about it.
Edit: Showing code as requested:
#define SM_SHARE_IMAGE_AND_STRING 1
-(void)actionToolbarViewControllerUserTappedShareButton:(SMActionToolbarViewController*)sender{
// Reposition anchor view for UIPopoverController to point at
[self repositionAnchorViewToButtonFrame:self.actionToolbarViewController.shareButtonFrame];
// Asynch download of image
[SMUtility downloadAsset:self.selectedAsset completion:^(UIImage *image) {
// Create image source
SMActivitySource *activityImageSource = [[SMActivitySource alloc]initWithImage:image];
#if defined(SM_SHARE_IMAGE_AND_STRING)
// Create string source
NSString *assetsString = [SMUtility assetsString:[NSArray arrayWithObject:self.selectedAsset]];
SMActivitySource *activityStringSource = [[SMActivitySource alloc]initWithString:assetsString];
// Present UIActiviyViewController within an UIPopoverController
NSArray *items = [#[activityImageSource, activityStringSource]mutableCopy];
#else
NSArray *items = [#[activityImageSource]mutableCopy];
#endif
UIActivityViewController *activityViewController = [[UIActivityViewController alloc]initWithActivityItems:items applicationActivities:nil];
[activityViewController setCompletionHandler:^(NSString *activityType, BOOL completed){
[SMMixPanel eventSharePhotoMethod:#"Share"];
}];
self.buttonPopoverController = [[UIPopoverController alloc] initWithContentViewController:activityViewController];
[self.buttonPopoverController presentPopoverFromRect:self.anchorView.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}];
}

Answer 1

The Print, and Assign To Contact activities are standard activities shown by the UIActivityViewController as long as you provide the proper data.
You must provide a UIImage for the Assign To Contact activity. See the docs for UIActivityTypeAssignToContact. See the docs for UIActivityTypePrint for details on what it accepts.
The "Use As Wallpaper" seems to be a custom activity shown only in the Photos app.