https://developers.weixin.qq.com/doc/offiaccount/Asset_Management/New_temporary_materials.html

调用上传临时素材接口上传视频（MP4）再通过客服消息接口发送视频消息给微信用户，微信用户端收到视频消息无法播放，可以看到视频缩略图。

{"accessTokenInvalid":false,"attrs":{"item":[],"media_id":"eh_ASWcbXQA_GCmlMljVJqZEhj1JIJ5ZX42Up7ERBr3iDGSNcgEtZ8rNmIlBCYra","created_at":1631955139,"type":"video"},"json":"{\"type\":\"video\",\"media_id\":\"eh_ASWcbXQA_GCmlMljVJqZEhj1JIJ5ZX42Up7ERBr3iDGSNcgEtZ8rNmIlBCYra\",\"created_at\":1631955139,\"item\":[]}","succeed":true}