Audio insertion adds additional blank slides (images)

When creating a slideshow, I insert 118 images, no problem. I then insert a 4:50 audio and Fotomagio inserts additional blank slides so I have a total of 163. Cannot delete the slides or set audio to slide length. any advice would be greatly appreciated.

Thank you

You have to drag the end of the audio bar and thrust aside left to the last slide.

Rainer