https://www.finalsitesupport.com/hc/en-us/articles/115001140271-Embedding-content-on-site-pages 

• Compose 

• Add element (Hover over content box. Add element should appear towards the bottom.) 

• Embed

https://www.finalsitesupport.com/hc/en-us/articles/115000852567-Embed-element 

• Open the settings by clicking the settings wheel within the content box or clicking within the box itself.  

• Paste the embed code from Google slides into the box.  

• To embed a Google Slide on Finalsite, open your Google Slides presentation, go to "File" > "Publish to the web", select the "Embed" tab, copy the generated embed code, then paste it into the "Embed" element within your Finalsite page editor.  

• Access your Google Slides presentation: Open the presentation you want to embed on Finalsite.  

• Publish to the web: Go to "File" > "Publish to the web".  

• Select "Embed" tab: In the publishing window, click on the "Embed" tab.  

• Copy the embed code: The HTML code will appear in a box, copy it.  

• Open your Finalsite page: Navigate to the page where you want to embed the slide.  

• Insert the "Embed" element: Use the "Embed" element within the Finalsite editor.  

• Paste the code: Paste the copied embed code into the "Embed" element.  

• Important points to remember: 

• Make sure your Google Slides presentation is set to "Public": to allow embedding.  

• Adjust size and other options: You may be able to customize the size and other display settings of the embedded slide within the "Embed" element on Finalsite. 

• Save 

• Publish (lower right corner of Finalsite)