AttachmentMetadata

{
    "author": {},
    "content": "string",
    "created": "2019-08-24T14:15:22Z",
    "filename": "string",
    "id": 0,
    "mimeType": "string",
    "properties": {
        "property1": null,
        "property2": null
    },
    "self": "http://example.com",
    "size": 0,
    "thumbnail": "string"
}