How to add attachments to a document using API v3?

I am entirely new to Jive and looking for help with a problem I have to solve. Using the Jive API(https://developers.jivesoftware.com/api/v3/) I have to attach multiple files to a document and create the document with API (Jive REST API v3.14 → Document entity ). I looked at the attachments api (Jive JavaScript API v3.14 → osapi.jive.corev3.attachments class )  but found no help or instructions on how this can be done. Your help would be greatly appreciated.