Which is the office online preview function of word-view.officeapps.live.com, youdao Cloud Association?

the url, used by Cloud Collaborative online Preview of word documents can be seen to be the official domain name of Microsoft.

https://word-view.officeapps.live.com/wv/wordviewerframe.aspx?ui=zh-cn&access_token=5b5c76d962e6efdcc18bf9793afb409b&WOPISrc=https%3A%2F%2Fnote.youdao.com%2Fyws%2Fapi%2Fwopi%2Ffiles%2Ff36c96c377a4396acd6ed95e9b0c246185e19391444d926939837ab484af83b853a23e31b81d53eb

< hr >

but the online preview link I found from Microsoft officially goes like this:

https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Foi61yj216.qnssl.com%2Fa.doc

View Office documents online

< hr >

I found the same question in the Microsoft help Forum:
https://answers.microsoft.com.
, but there is no exact answer here.

< hr >

it seems that the online preview API used in cloud collaboration can have more parameters. I want to know where the official document of this API is. Does any god know? Thank you very much!

Php microsoft office Youdao-cloud-notes asp
Mar.25,2021

Hello, blogger, I would like to ask if the file on the server has changed, but the file previewed using http://view.officeapps.live.com/op/view.aspx has not changed, is it because of cache

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