Hello. We ask for additional comments and votes be left on the open idea for inserting a slideshow into a campaign, instead of posting/commenting here . Our Product team regularly reviews our Feedback boards more than our Get Help area. Though we do not have a time estimate if a feature like this will be available in the product, any updates will be posted there, not on this post. Voting and commenting on that post helps to influence future product decisions and allows you to be notified of replies from our teams.
As a workaround I would suggest creating the slideshow in an outside source and connecting it to your email campaign through a clickable URL. Another option would be creating a slideshow as a GIF. If you chose to create a GIF we have this helpful article on how to insert a GIF into your email campaign. I hope these options are helpful to you!
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