Can't access iTunes Library or photo folders

Can’t access iTunes Library or photo folders.

Can only add photos by dropping them individually into bottom lower section of viewer window. Have tried setting preferences to allow all libraries, some libraries, no libraries. Nothing changes. How can I add music to my slide show if I can’t access the files???

Very annoyed!

Using:
MacBook Pro Intel Core i7 2.66 GHz
OS X 10.11.5 (15F34) Darwin 15.5.0

Terri

Hi Terri,
are your media libraries located on your internal drive or somwehere external?