Log Single Document during Email & Document Merge

When I create a merge that includes both email and document in one action, if only a single document is created, I am unable to log the document in the File storage of the related record. This is crucial for our organization, meaning that I have to create separate merge actions and have our users click two separate buttons. We need a saved version of the document in the related record.

In short, it would be great to be able to log the single PDF document, generated during an email and document merge, as a File on the related record.