A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Hi Jsmalls100,
As per the description, it seems like this presentation can be opened normally from other devices like PCs or other mobile devices. If my understanding is correct, since you have tried the steps like update, restart, reinstallation but the issue persists, my suggestion to fix this efficiently is to open the presentation on other available device and save a copy of it and then open the copied file to edit on PowerPoint for iPad.
If you want to further investigate the root cause of the can't open error on your updated PowerPoint app and iOS on iPad, it requires to contact the online support team and engineers there have the support resources to make remote session with your iPad and collect the HAR logs to trace the issue. Click: Contact Us - Microsoft Support
Please correct me if I made any misunderstanding or if there have anything else I can do for you.
Your patience is highly appreciated. Hope you a nice day and stay safe!
Best Regards,
Mia