Can I Edit an Imported Presentation?
Yes and No.
You can add an interactive question to your imported slides.
For example, this is an imported Google Presentation. As you can see, the slides are each Normal Slides.
To add an interactive question, change the slide type.
And add a question in the title spot.
Unfortunately you cannot edit the images and text on the imported slides. They come into Pear Deck as images and cannot be changed.