Google Slides for Confluence allows you to easily embed Google Slides files into your Confluence page.
Copy the public URL address of your Google Slides file (as shown here)
Paste it into your Confluence editor
(Optional) Edit the viewer settings
Copy the URL address of your Google Slides file (as shown here)
Open the Google Slides macro in Confluence typing /slides
Paste the URL of the file into the corresponding section
(Optional) Edit the viewer settings