Video does not appear on a photo sharing app

- (void)viewDidLoad
{
    [super viewDidLoad];
}


-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    if (self.image == nil && [self.videoFilePath length] == 0) {
        self.imagePicker = [[UIImagePickerController alloc] init];
        self.imagePicker.delegate = self;
        self.imagePicker.allowsEditing = YES;
        self.imagePicker.videoMaximumDuration = 10;


        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        } else {
            self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        }

        self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePicker.sourceType];

        [self presentViewController:self.imagePicker animated:NO completion:nil];
    }

}


-(void)viewDidDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self clear];

}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"signUp"]) {
        [segue.destinationViewController setHidesBottomBarWhenPushed:YES];
    }
}


-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    UIImage *chooseImage = info[UIImagePickerControllerEditedImage];
    self.chosenImageView.image = chooseImage;
    [self dismissViewControllerAnimated:NO completion:nil];


}

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:NO completion:nil];
    [self.tabBarController setSelectedIndex:0];

}

-(void)clear {
    self.chosenImageView.image = nil;
    self.videoFilePath = nil;
}

- (IBAction)share:(id)sender {
    if (self.chosenImageView.image == nil && [self.videoFilePath length] == 0) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Try again!"
                                                        message:@"Please capture or select a photo or video to share!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [self presentViewController:self.imagePicker animated:NO completion:nil];
    }
    else {
        [self uploadMessage];
    }
    [self clear];
    [self.tabBarController setSelectedIndex:0];
}


-(void)uploadMessage {
    NSData *fileData;
    NSString *fileName;
    NSString *fileType;

    if (self.chosenImageView.image != nil) {
        fileData = UIImagePNGRepresentation(self.chosenImageView.image);
        fileName = @"image.png";
        fileType = @"image";

    }
    else {
        fileData = [NSData dataWithContentsOfFile:self.videoFilePath];
        fileName = @"video.mov";
        fileType = @"video";
    }

    PFFile *file = [PFFile fileWithName:fileName data:fileData];
    [file saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (error) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"An error occurred" message:@"Please try sending your message again." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];
        }
        else {
            PFObject *message = [PFObject objectWithClassName:@"Photo"];
            [message setObject:file forKey:@"image"];
            message[@"whoTook"] = [PFUser currentUser];
            message[@"title"] = self.description.text;
            [message saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
                if (error) {
                    [self showError];
                }
                else {
                    //Everything was successful
                    [self clear];
                }
            }];
        }
    }];
}
-(void)showError {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                    message:@"Could not post your photo or video, please try again" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
}


-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [self.description resignFirstResponder];
}