Issue with audio for slideshow with Photos I have a problem when adding music to a slideshow in photos. When I add a piece of music and check the 'fit to music' the timing is never right and I'm left with about a minute of silence at the end of the slideshow.

Alternatively if I try and vary the time of the slideshow manually, it won't let me and resets itself to default time.

Both of these issues mean that I cannot get a piece of music to fit in time with a slideshow, which is proving highly frustrating.

I'm using a new MacBook OS X Yosemite 10.10.5 (14F27)
I'm not able to reproduce what you are saying. The duration in the top right under export seems responsive. I add the song I want, notice how long it plays and the slide show duration updates.

My guess is you have more than one song queued in the top right under selected music, but it's hard to know without poking around your project.



 The above is from Version 1.1 (330.21.0)