In workflow designer, we can upload our template ("company paper") & also download/upload to make changes/updates.
https://support.ironcladapp.com/s/article/How-to-Build-a-workflow-in-Workflow-Designer#update
Only .docx format can be used.
We can of course use Microsoft Word or Google Docs to edit .docx files.
My idea is to take advantage of the cloud nature of Google Docs & instead of Download/Upload, offer "Edit with Google Docs" or "Open with Google Docs"