I need a proof of concept to write a "hello world" value back into an extended property in an xlsx file. The code will be part of an estimate template used as a template in an Office365 Sharepoint Library, so it needs to work when using the Office Web-app and desktop version of Excel. My understanding is we will need to use the [login to view URL] api. A simple spreadsheet where I can press a button and the current time/date gets written into an extended property called "load date" will work.
[login to view URL] is a good example of how I want to approach the solution to write extended values.
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