Describes the cause and action for error messages.
Error Message(English)：
document was not saved
Excel issues with Upload Center - Microsoft Tech Community - 205980
https://techcommunity.microsoft.com/t5/SharePoint/Excel-issues-with-Upload-Center/td-p/205980
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https://www.wikihow.com/Recover-a-Corrupt-Excel-File
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https://stackoverflow.com/a/15947323
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http://blog.xceed.be/Blog.nsf/dx/using-webquerysave-with-javascript
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https://www.ibm.com/support/knowledgecenter/en/SSEUEX_3.0.5/com.ibm.installingeuc.doc/eucco056.htm
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https://www.yodot.com/file-recovery/word-document-after-computer-shutdown.html
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https://support.office.com/en-gb/article/view-office-documents-online-1cc2ea26-0f7b-41f7-8e0e-6461a1・・・
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https://es.mathworks.com/help/slrequirements/examples/managing-requirements-for-fault-tolerant-fuel-・・・
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https://ask.libreoffice.org/en/question/81002/calc-for-new-pupils/