Slideshow ads in Meta Ad Manager are now created under Video Ads using image sequences. Meta has shifted away from calling them “Slideshow Ads” directly, but you can still make them by following these steps:
How to Create Slideshow Ads in Meta Ad Manager:
1) Go to Ads Manager and create a new campaign.
2) At the Ad level, choose “Single image or video” under Ad Setup.
3) Under Ad Creative, click “Create video”.
4) Choose “Slideshow” from the list of options.
5) Upload 2–10 images to use in your slideshow.
6) Customize:
- Duration per image
- Transitions
- Music (optional)
7) Save and continue as a video ad.
You can also use Meta's Video Creation Kit to generate slideshows from templates inside the Creative Tools section.