title: Upload attachment field via REST API
body: <p>I'm using Archer REST API to upload a new attachment.<br>
  After i'm uploaded the attachment i have a <code>File Id</code>, now i'm trying to update field of the record with the new attachment, what i'm trying in the request body:<br></p>
  
  <pre><code>{"Content":{"Id": 278800, "LevelId" : 222,"FieldContents" : {"21771" : {"Type" : 11, "Value" : {"File id" : "1738", "Value": "RestUpload.xml"}, "FieldId" : 21771}, "16108" : {"Type" : 1, "Value" : "RestAPI Text x3", "FieldId" : 16108}}
  </code></pre>
  
  <p>I got the following result:<br></p>
  
  <pre><code>{
  "Links": [],
  "RequestedObject": {
      "Id": 278800
  },
  "IsSuccessful": true,
  "ValidationMessages": []
  }
  </code></pre>
  
  <p>But only the Text field updated.<br>
  What i need to fix?<br>
  Thanks.</p>