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Hm, I wonder if I can marry this with Flysystem (https://github.com/thephpleague/flysystem) so I can use PHP builtin functions rather than being tied to their API.

Maybe I'll give it shot!

You can use PHP built-in functions. Check out the readme. The API is shown alongside using functions like file_put_contents and require.

I know, I'm referring to using those built-in functions in place of Flysystem's API. Basically a proxy.