I have a need for the user of the powerpoint presentation to add a unique logo each time they use it. Rather than have them insert the same logo in the same place on each slide (over 50 slides), is there a way to have them add the logo once and it is placed in it's appropriate place throughout all of the slides?

We do not want them to modify the master slide.

Ideally, there would be an image placement added to the main master slide, but I've tried adding and unfortunately, the master slide doesn't allow image placements.

Thank you.