Google Drive通过iOS的选择器禁用.apk和.ipa文件

Question

这里我附上了谷歌驱动器的截图。

Image

当我尝试通过UIDocumentMenuViewController从iOS应用程序附加文件时，.ipa和.apk文件显示为灰色。它是禁用的，所以我不能选择它。那我怎么能启用它？

这是我的代码：

  UIDocumentMenuViewController *viewController = [[UIDocumentMenuViewController alloc] initWithDocumentTypes:@[@"public.data"] inMode:UIDocumentPickerModeImport];
    viewController.delegate = self;
    //viewController.modalPresentationStyle = UIModalPresentationFullScreen;

    viewController.popoverPresentationController.sourceView = [self popoverPresentationView];
    viewController.popoverPresentationController.sourceRect = [self popoverPresentationRect];
    viewController.popoverPresentationController.permittedArrowDirections = [self popoverPresentationArrowDirection];

    [self.initialViewController presentViewController:viewController animated:YES completion:nil];

请有人帮忙..提前致谢..