Embedding Mentimeter into your presentation
How do plug-ins work in Mentimeter?
PowerPoint plugin and integrations
You can either upload your PowerPoint presentation into Mentimeter (recommended) or upload Mentimeter into your PowerPoint presentation.
HINT: there can be some lag time when integrating Mentimeter into PowerPoint so it is recommended that you keep Mentimeter open and Alt + Tab between screens.
How to import a presentation?
Link: How to import a presentation
Mentimeter can also be used as presentation tool so instead of embedding Mentimeter into PowerPoint, why not embed your PowerPoint into Mentimeter?
Please note: this works best if there are no animations so if you have a basic presentation, why not use Mentimeter as a presentation tool and embed the digital polling throughout.
This resource outlines how you can upload your PowerPoint, Keynote or Google Slides presentation to Mentimeter.