A slideshow stands for memories or ideas shown one at a time in a set order. Tradition reads it as reviewing your past, or as presenting yourself and waiting to be judged.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.