Microsoft on-premises server product that runs Office Online.
Hi Allen Liu
Thank you for posting your question on the Microsoft Q&A Forum.
Based on my research, there is currently no official Microsoft documentation that clearly describes how data is cached or retained when using the view.officeapps.live.com service.
However, based on feedback and observations from other users, there are indications that the service may temporarily cache documents for rendering purposes. For example, in some cases, documents remained accessible for a short period even after the original source file was removed.
You may refer to a similar thread for more information: What is the status of view.officeapps.live.com? - Microsoft Q&A
I hope this helps.
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