Hi @RobinTurnmire-5748,
Where did you get the PowerPoint files?
What version of Office did you create the PowerPoint file?
I suggest you try to open the file in earlier version of PowerPoint and check the result.
Can you find the images from local folder? You can try to change the images location and re-link in PowerPoint.
As you said the file is saved in cloud, you can save the file and images at the same cloud folder.
I also suggest you install the latest updates for Office in PC.
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