How to add only a document to any workflow ?

Summary:

The requirement is to add only a document to a workflow. Due to limitation of PPM workflow, we plan to create a workflow in PD module and only a document as an affected item to this Change Order workflow.

The current functionality is - to add affected item and this affected item can have document in the attachments tab.

However, the requirement is to add only any document in the attachments tab . How to achieve this ?

Content (please ensure you mask any confidential information):

na

Version (include the version you are using, if applicable):

na

Code Snippet (add any code snippets that support your topic, if applicable):