微信公众号图文消息预览和发布的时候缩略图无法显示，一直转圈圈

在微信公众号后台群推的消息——文章，能否通过接口下载保存

无法通过API发送学校通知 https://qyapi.weixin.qq.com/cgi-bin/externalcontact/message/send?access_token=83HNdNg41mIpUodDqVaaB1VhBp2xlvkIbogtHQm2rXXkbtCht921QchQ4H5mgj6eFWAtXABC_GzBDmZnvn56VDPBhvAO1wVjHjwyEsEJ4pFL5Pm3OxEQd8jqEYtJbVTaU4qW0kO_oCn54c_Lg7YSlxrKm0yWMIAaGI7CefkNoRsMGef5fA5DkOIC6YTE3BiX1LiqMuOmWXj5w5bd8MXt9g {"to_parent_userid":["562a16825a94c55b3e726be31bee9475"],"toall":0,"msgtype":"text","agentid":1000004,"text":{"content":"2021-01-25还未完成，请尽快完成！！"}} {"errcode":301002,"errmsg":"Warning: wrong json format. not allow operate another agent with this accesstoken., hint: [1611576305_150_7c4a566c8ea6c9a638536297a03716e4], from ip: more info at https://open.work.weixin.qq.com/devtool/query?e=301002","invalid_external_user":[],"invalid_tag":[],"invalid_parent_userid":[],"invalid_student_userid":[],"invalid_party":[]}