Plumsail Signature to Word template

How can I save a signature onto a Word file without the use of Plumsail documents?

Ideally I would be able to save the image in a picture-type developer field on the Word template file using PowerAutomate. I can't get my head around the Base64 conversion, is there a simple guide I can follow to help me achieve this?

Thanks

Dear @Rob_Symmons,
For Docx itself, you can refer to this article - PDF document from SharePoint form based on Word template — Plumsail SharePoint Forms Documentation

Here's more about signature and what actions you can use - How can I add Ink Sketch and Likert Scale into word document using Power Automate?