I am looking for some help on how to add an attachment on CosmosDB. Here is the little background.

Our application is currently on IBM Bluemix and we are using CloudantDB. We use CloudanDB to store attachments (PDF file). We are no moving to Azure PaaS App Service and planning to use CosmosDB. I am looking for help on how to create an attachment on CosmosDB using Java API. What API do I need to use? I want to do a small POC.

Thanks,