You can insert a slideshow in your Google Slides.
As you will see on the video below, you’ll have to create the slideshow that you want to insert, as an example, I created one with pictures. Then prepare your main file.
Once you have both ready, go to TallTweets, scroll to Tall Tweets Classic and click on ‘Select Presentation’ – If it’s your first time using Tall Tweets, it will ask you to sign in with your Google account (if you have more than one, make sure you select the account where you have your Google Slides saved).
Select the presentation that you want to embed, and once Tall Tweets finishes working, click on CREATE GIF. When ready, click on SAVE.
Now you can go back to your main file and insert it as an image. And done!
ATTENTION GOOGLE SLIDES USERS: PLEASE, DO NOT REQUEST FOR ACCESS. If you are prompted to “Request for access·” (sometimes it happens when you are logged in more than one Google account or when you are logged in a Google for Education account and your IT Admin has blocked the access), you can try again by logging in a personal Gmail account, and signing out of all the other accounts.
The other workaround is for you to download the pptx file, upload it to your Google Drive, and open it as Google Slides.
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Sebastian, an under the sea template for Google Slides or PowerPoint 
Pratt Free template for Google Slides or PowerPoint 
Sports Free Presentation Template for Google Slides or PowerPoint 
Digital Notebooks for Google Slides or PowerPoint 
