To create a multi-page (multi-step) Overlay , please follow the steps below :
1 - Create or clone a step:
2 - Create the button that links to the newly created step:
Click on the first step to activate it, then goo to the category "Steps", and drag & drop "Link To Step" or "Go to Step Image" into the popup.
3 - Linking the button to the step:
Once the button is on the popup, click on it, then click on the little icon on the right bottom to show its settings, and change the "STEP TO GO TO" setting to the step you want it to link to.