In order to add the slide show page follow the step-by-step instructions below:
1) Go to your app's Dashboard
2) Add a new page to your app by clicking the "+" button.
3) Select the "Slideshow" page type from the available list and click "Create".
4) Now, since the page is added to your app, you may go ahead and upload the images to it. Click "Edit" button next to the newly added page.
Once you access the Slideshow page editor you will notice that by default there are no items mentioned, thus, you need to click "+" button to add an item to the list.
After adding an item to the "Gallery Images" section click "..." button to call the Resource Manager window and select the image accordingly.
Once the Resource Manager window appears, switch to "Resources" tab and show the item to be added. Thus, select the file from the list of the files and click the "Choose" button to confirm your choice.
As soon as you finish up adding the images to your app's Slideshow page, make sure to save the changes.
Below you may see how the slideshow page looks on a device after the app is built.