目录API创建带有清单图像的课程

如何解决目录API创建带有清单图像的课程

我正在尝试通过API调用创建目录条目。创建成功，但是没有列表图像。（URL http://myfavoritehosting.edu/mywebapp/catalogimage.jpg绝对有效且可访问）有什么想法或建议吗？这是我的JSON：

{
    "title": "My test course- Gmail3","description": "My test course- Gmail3 long description here","listing_path": "2020-21-gmail3","listing_image": "http://myfavoritehosting.edu/mywebapp/catalogimage.jpg","teaser": "It's gonna be great!","account_id": 9486,"catalog": {
        "id": 9486
    },"canvas_course": {
        "id": 1566
    },"visibility": "listed","enrollment_open": true
}

文档说明：
course [listing_image]要与此列表一起显示的图像的URL或文件上传。字符串

谢谢！