微信公众号接口“修改永久图文素材”，怎么修改的同时新增

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怎么在修改图文素材的同时进行新增和删除操作

{ "media_id": "17384417820", "index": 0, "articles": { "title": "11", "thumb_media_id": "8793934228", "author": "11", "digest": "", "show_cover_pic": 1, "content": "

", "content_source_url": "11" } 其中 index 为修改素材的索引，如果我要新增一条图文时 index 要传什么？

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index 素材修改图文