Upload related content from APS process to ACS via API

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Upload related content from APS process to ACS via API

Hi,

I'm struggling with the upload of content inside a process in APS (1.9, Enterprise) to ACS via the REST-API. Until now I could use the "publish to Alfresco"-Task, but I'm not able to set the site if the sitename is created inside this process - even if I add the variable to the bpmn20.xml like

        <activiti:field name="site">
          <activiti:string><![CDATA[${sitename}]]></activiti:string>
        </activiti:field>

The error message is: "/sites/${sitename} does not exist". So I think Alfresco treats the variable as a string. Funny thing is, that this works for a subfolder:

        <activiti:field name="createFolder">
          <activiti:expression><![CDATA[${foldername}]]></activiti:expression>
        </activiti:field>

That's why I have to use REST Calls for more flexibility. What I've found and tried out is this: Link . Now I'm able to create a site, to add members, to create folders - everything what I need apart from uploading files belonging to some upload formfield in process. Uploading from local storage is not a big deal (see link) and creating a blank file is a piece of cake. 

I know that the processfiles are relatedContent and that they have a contentId. During execution this is the only variable I have about the uploaded file. So I tried to add it like this to the JSON with  POST /nodes/{id}/children:

{
  "name": ${contentId},
  "nodeType": "cm:content",
}

but this did not work. The contentId is not directly the file. So where is the file or where is its content stored? And at the end: How could I upload this relatedContent to ACS via API?

Cheers and thanks a lot,

Jannik