VK open api, wall.post can't attach a photo, why?

Question

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I send a request, the data variable contains the result of calling the photos.saveWallPhoto method, there are no errors. As a result, I can't see the photo, why?

VK.Api.call('wall.post', {
    v: "3.0",
    owner_id: data.response[0].owner_id,
    message: 'Текст поста',
    attachments: 'photo' + data.response[0].owner_id + '_' + data.response[0].id
}, function (data) {
   
});