I see, one other way of doing it, could be a video perhaps with your image and animations and then use video module in Xibo (so it also would be uploaded to the CMS and stored in player storage).
There is also this topic, you can contact Mikael Slideshow module feasibility?
We haven’t seen this custom module, so I’m not sure if it will work as you want or how many changes it would require to suit your project, but perhaps it could be interesting to you - keep in mind that’s 1.8 series and any custom dev should be considered for 1.8 (rc1 coming soon™)