Review 360: Files have become corrupted in Review.

Hi, I have a number of samples of ELChallenges on my profile via Review 360, they have been visible/accessible for months, but now some of them have become corrupted - this message shows (see attachment) on a number of them.

Example: it's been up for 7 months and has comments: https://360.articulate.com/review/content/c3b4b0c7-f272-49fb-99db-f0ef36fafa0e/review   

Any ideas why?

Thank you.

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