How to make the to be signed document automatically send from S3 to Adobe Sign

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I want to make the Adobe Sign embeded with our application。

Application scenario

1. Select a file that is saved in the S3 from our app

2. Click the [Adobe Sign] button 

3. Open the  [Adobe Sign] login page

4. The following page is opened , the selected file has been displayed in the files area 

Question:

I have tried to use the transientDocuments API to do that， but failed。

Could you please tell me how to do? 

All the files that to be signed

Whe

[SimonESATS]

transient document uploads a file into Sign and provides you with an ID for the file.

You then need to make a seocnd api call to post /agreements  using this file id to creaet teh agreement obect.

https://www.adobe.io/apis/documentcloud/sign/docs.html#!adobedocs/adobe-sign/master/gstarted.md