Document id in integration object

We have a  integration object that makes a http call and gets a document as a response. We are saving it into a folder using save into option .

Now we need to read and view the document in other places of the process model.For that we need the document id  of the document that's saved in the integration call.

So is there any way to store the document id in a process variable in the integration object itself ?  I dont see any such optiok there. If there's any other way we can do that also ,let me know.

Thanks in advance.