I have another idea: we may not be able to find a solution that works on all platforms, but since the only goal is to save the file, there may already be a workaround that others have already done and we just need to use. I am thinking of Google Drive, Dropbox, Syncthing (which is open-source): they can handle even if the user is offline, so they can also be used to explicitly use them offline. I don't know if it is possible to make a request to the apps from a browser, so far this is just an idea.
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