https://developers.weixin.qq.com/doc/offiaccount/Draft_Box/Add_draft.htmlhttps://developers.weixin.qq.com/doc/offiaccount/Asset_Management/New_temporary_materials.htmlhttps://developers.weixin.qq.com/doc/offiaccount/Draft_Box/Add_draft.html 如何建 图片消息草稿和视频草稿？？？？？ api只有图文草稿