Microsoft Power Automate template
Convert a PowerPoint file in SharePoint to PDF and add a text watermark
By PDF Blocks
Use this flow to convert a PowerPoint presentation in a SharePoint library into a PDF, add a text watermark to the PDF file, and then save the watermarked PDF document to SharePoint. The watermark will appear behind the content of each page of the PDF document. To start this flow, choose the PowerPoint presentation in your SharePoint library, and enter up to three lines of text for the watermark.