This gave part of the answer (the graph api) but still doesn't get to what is actually 'happening' which was the gist of my question. I was able to do deeper digging and found a lot of information on the placeholder file types and such. Interestingly, the icloud software uses the same onedrive / graph api that onedrive. I'm trying to trace what is happening on a cloud file from the time it appears to hydration which is still a mystery.
what exactly is happening during automatic file downloads
When icloud, dropbox, onedrive, etc. sync files to/from the cloud, are they using microsofts automatic file downloads feature? If so, is there an underlying windows api that I can use to control this functionality?
Windows for business | Windows Client for IT Pros | Devices and deployment | Other
Microsoft 365 and Office | OneDrive | For business | Windows
A Microsoft file hosting and synchronization service.
Developer technologies | C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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Emi Zhang-MSFT 30,191 Reputation points Microsoft External Staff2021-01-04T09:09:13.083+00:00 Hi @Allen ,
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Alberto Poblacion 1,571 Reputation points
2021-01-02T08:17:52.303+00:00 As far as I can tell, each of the cloud storage providers uses its own API. In Windows, you install some software that uses the corresponding API to perform the file downloads. So the functionality is not built into Windows, but rather depends on custom software from each provider.
In the case of OneDrive, you can find the API documented here.