Hi Robert,
Thank you for your update.
We can add an image to slide in the following ways,
1. As slide’s background – Can be added to fit the slide’s width and height.
2. As slide’s shape – Can be added in a desired position and size within the slide.
We have created a sample to demonstrate the above scenarios which can be downloaded from the below link,
You may use the online UG documentation link to explore about working with images using Presentation library,
Please let us know if you need any clarification,
Thanks,
Devisri