I expected to find the Sharing-API [1] in the list. I just found out about it recently and have used it multiple times since then. It even works on iOS.
[1]: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/s...
[1]: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/s...
It's also easy to abuse [1]
[1]: https://blog.redteam.pl/2020/08/stealing-local-files-using-s...