We have a presentation we are giving with multiple prototypes. One flow per slide to show different features.
Each prototype that was inserted kept changing from the selected flow to just the first page of the linked file, which is a cover page in our case.
We couldn’t figure out how to fix the problem but found that putting the prototypes on the first page of the source Figma file allowed them to work in the presentation.
If anyone is having a hard time figuring this out, this workaround should work.