I have used Photostory for slideshows before and was able to simply drag and drop the MP3 file into the audio track, but when I tried recently to add music to some family photos, the audio file refused to fill in the track. I can move the generic music that comes with the software, but not an MP3 file that had worked in a previous slideshow. I am using a very old version of Photostory (15 yrs old?) with Windows 10. The picture files drag and drop as expected but the audio files will not