12. in TH's THConversationShareViewController.m, starting at line 222

THConversationShareViewController.m

- (void)doPreviewImageGesture:(UIGestureRecognizer *)gesture {
    if (gesture.state != UIGestureRecognizerStateRecognized) {
        return;
    }

    if ([THFeature isOn:kTHFeatureImageShareEdit]) {
        [[Mixpanel sharedInstance] track:@"Share Image Preview Tapped"];
    }

    [self.conversationShareView.textView resignFirstResponder];
    
//Flatiron code:
    self.editViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    self.editViewController.delegate = self;

    if (!self.editViewController.imageToProcess) {
        self.editViewController.imageToProcess = self.conversationShareView.previewImageView.image;
    }
    
    UINavigationController *editNavController = [[UINavigationController alloc]initWithRootViewController:self.editViewController];

    //TH code commented out: controller.hidingWatermark = YES;
    //TH code commented out: controller.showsEditButton = [THFeature isOn:kTHFeatureImageShareEdit];
    [self presentViewController:editNavController animated:YES completion:nil];
}

This is the only section of code from the original TH app files that we modified.