Adobe sign API

Hi all,

Current workflow =

• User fills in a html form
• Data from the form is pushed to a pdf
• the pdf is uploaded to adobe and the widget is returned to the user to digitally sign

I have been trying to add an existing pdf to the widget which I have managed to do using the /agreeements endpoint and supplying to documents:

 "fileInfos": [
    {
      "transientDocumentId": "..."
    },
     {
      "libraryDocumentId": "..."
    }
  ],

The library document I am including is a fillable form however when I upload and return to the user the form fields are read only. Any one have any ideas?