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How about going for an independent cloud storage like Dropbox, they are not affiliated to any OS or Windows platforms

Dropbox has had a number of security concerns[1].

Dropbox is headquartered in the US and is subject to US law, and interpretations thereof.

Dropbox has a history of taking on US government bureaucrats for roles in the company, including members of the US Intelligence Community[2].

If any of these clash with your threat model, look elsewhere? Syncthing[3] might be your thing.

2. No link, because someone "sterilized" Dropbox's Wikipedia article of those particular controversies.

Dropbox is based in San Francisco - and also needs some kind of operating system to be accessed.