Before creating Picture Gallery Slideshow you need to have an existing picture gallery.

Creating a Picture Library

• Select "Add an App" from the site admin dropdown menu.
• Select Picture Library and name it (e.g. The Earth Palette)
  
  
  
• The newly created picture library appears under Picture Libraries heading in All Site Content
  
  
   
• Upload photos to the picture gallery
• Double click on each photo to open the image properties window
• Add title and description

Creating a Picture Gallery Slideshow

• Create a webpage to display the slideshow
• Click Edit Page
• Place the cursor at the location you want to insert the Web Part
• Select Insert > Web Part from the ribbon
• In the Categories, select Media and Content > Picture Library Slideshow Web Part
  
  
  
  
• Click on Add

Editing Picture Library Slideshow Web Part

• Select Edit Web Part from the dropdown menu
  
  
  
  
• Web Part configuration:
  
  
   
  • Duration to Show Picture (seconds)
    Enter the amount of seconds before a new picture will appear.
  • Picture library
    Select the picture library name from the dropdown if there are more than one.
    
  • ​IMPORTANT: ​Please make sure the images in the library feature alternative text before publishing! For a recap on how to add alternative text, please refer to the Images se​ction in the Web Accessibility M​anual​. 
    
  • Library view
    Select the view.
  • Picture Display Mode
    Show the pictures in random or sequential order.
  • Display with
    Options to display title and description.
    
    
     
  • Show toolbar
    Navigate to the next or previous picture or stop the slideshow.
    
    
• << View Picture Library Slideshow sample >>